diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 78def1fc1..7366f727c 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -44,6 +44,12 @@ GitHub provides additional document on [forking a repository](https://help.githu
 Looking at the existing issues is a great way to find something to contribute on. As our projects, by default, use the default GitHub issue labels (enhancement/bug/duplicate/help wanted/invalid/question/wontfix), looking at any ['help wanted'](https://github.com/awslabs/aws-lambda-builders/labels/help%20wanted) issues is a great place to start. 
 
 
+## Testing with SAM CLI
+
+1. [Activate Virtualenv](https://github.com/awslabs/aws-sam-cli/blob/develop/DEVELOPMENT_GUIDE.md) that is used for SAM CLI development.
+2. Navigate to aws-lambda-builders project on your machine
+3. `pip install -e .` (This will install the editable version of the aws-lambda-builers into SAM CLI's Virtualenv)
+
 ## Code of Conduct
 This project has adopted the [Amazon Open Source Code of Conduct](https://aws.github.io/code-of-conduct). 
 For more information see the [Code of Conduct FAQ](https://aws.github.io/code-of-conduct-faq) or contact 
diff --git a/LICENSE b/LICENSE
index d64569567..265968d37 100644
--- a/LICENSE
+++ b/LICENSE
@@ -187,7 +187,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright [yyyy] [name of copyright owner]
+   Copyright 2018-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
diff --git a/README.md b/README.md
index a99727c94..87ea496f5 100644
--- a/README.md
+++ b/README.md
@@ -6,5 +6,17 @@
 Lambda Builders is a Python library to compile, build and package AWS Lambda functions for several runtimes & 
 frameworks.
 
-We are in the process of implementing this project . If you are a developer and interested in contributing, 
-read the [DESIGN DOCUMENT](./DESIGN.md) to understand how this works.
+Lambda Builders currently contains the following workflows
+
+* Java with Gradle
+* Java with Maven
+* Dotnet with amazon.lambda.tools
+* Python with Pip
+* Javascript with Npm
+* Ruby with Bundler
+* Go with Dep
+* Go with Mod
+
+Lambda Builders is the brains behind the `sam build` command from [AWS SAM CLI](https://github.com/awslabs/aws-sam-cli)
+
+If you are a developer and interested in contributing, read the [DESIGN DOCUMENT](./DESIGN.md) to understand how this works.
diff --git a/aws_lambda_builders/__init__.py b/aws_lambda_builders/__init__.py
index f6d3af2b1..a0adf692b 100644
--- a/aws_lambda_builders/__init__.py
+++ b/aws_lambda_builders/__init__.py
@@ -1,5 +1,5 @@
 """
 AWS Lambda Builder Library
 """
-__version__ = '0.3.0'
+__version__ = '0.4.0'
 RPC_PROTOCOL_VERSION = "0.3"
diff --git a/aws_lambda_builders/utils.py b/aws_lambda_builders/utils.py
index d5b2ec9aa..b8e6e3ea7 100644
--- a/aws_lambda_builders/utils.py
+++ b/aws_lambda_builders/utils.py
@@ -36,7 +36,7 @@ def copytree(source, destination, ignore=None):
         try:
             # Let's try to copy the directory metadata from source to destination
             shutil.copystat(source, destination)
-        except WindowsError as ex:  # pylint: disable=undefined-variable
+        except OSError as ex:
             # Can't copy file access times in Windows
             LOG.debug("Unable to copy file access times from %s to %s", source, destination, exc_info=ex)
 
diff --git a/aws_lambda_builders/workflows/python_pip/actions.py b/aws_lambda_builders/workflows/python_pip/actions.py
index e2c0cb3fb..7886edc65 100644
--- a/aws_lambda_builders/workflows/python_pip/actions.py
+++ b/aws_lambda_builders/workflows/python_pip/actions.py
@@ -14,7 +14,7 @@ class PythonPipBuildAction(BaseAction):
     PURPOSE = Purpose.RESOLVE_DEPENDENCIES
     LANGUAGE = 'python'
 
-    def __init__(self, artifacts_dir, manifest_path, scratch_dir, runtime, binaries):
+    def __init__(self, artifacts_dir, scratch_dir, manifest_path, runtime, binaries):
         self.artifacts_dir = artifacts_dir
         self.manifest_path = manifest_path
         self.scratch_dir = scratch_dir
@@ -34,9 +34,9 @@ def execute(self):
                                                      dependency_builder=dependency_builder)
         try:
             package_builder.build_dependencies(
-                self.artifacts_dir,
-                self.manifest_path,
-                self.scratch_dir
+                artifacts_dir_path=self.artifacts_dir,
+                scratch_dir_path=self.scratch_dir,
+                requirements_path=self.manifest_path
             )
         except PackagerError as ex:
             raise ActionFailedError(str(ex))
diff --git a/tests/unit/workflows/python_pip/test_actions.py b/tests/unit/workflows/python_pip/test_actions.py
index c2ed21c2b..0f9be9484 100644
--- a/tests/unit/workflows/python_pip/test_actions.py
+++ b/tests/unit/workflows/python_pip/test_actions.py
@@ -24,9 +24,9 @@ def test_action_must_call_builder(self, PythonPipDependencyBuilderMock):
                                       })
         action.execute()
 
-        builder_instance.build_dependencies.assert_called_with("artifacts",
-                                                               "scratch_dir",
-                                                               "manifest")
+        builder_instance.build_dependencies.assert_called_with(artifacts_dir_path="artifacts",
+                                                               scratch_dir_path="scratch_dir",
+                                                               requirements_path="manifest")
 
     @patch("aws_lambda_builders.workflows.python_pip.actions.PythonPipDependencyBuilder")
     def test_must_raise_exception_on_failure(self, PythonPipDependencyBuilderMock):