release 0.29.1 (#652)

Changes included in this release are fixes:

In artman:

- pass the specific YAML loader to yaml.load #648 
- fix --local runs #650

In gapic-generator:

- samplegen: add sample_config.proto to the config_java_proto BUILD target googleapis/gapic-generator#2852
- go: URL encode x-goog-request-params googleapis/gapic-generator#2851
- ruby: ake it possible to pass metadata to the operations client googleapis/gapic-generator#2856

Dockerfile

@@ -5,7 +5,7 @@ ENV GOOGLEAPIS_HASH ab437f2bb2100360f8d119530b0a020228baa4cc
 ENV GAPIC_GENERATOR_HASH 2b955cdc6e5f192db7b1edce818a4600ed98deda
 # Define version number below. The ARTMAN_VERSION line is parsed by
 # .circleci/config.yml and setup.py, please keep the format.
-ENV ARTMAN_VERSION 0.29.0
+ENV ARTMAN_VERSION 0.29.1
 
 ENV DEBIAN_FRONTEND noninteractive