Update README.md

README.md

@@ -5,13 +5,31 @@ on [caarlos0/shell-ci-build](https://github.com/caarlos0/shell-ci-build).
 
 ## How to
 
+### Check your scripts
+
 ```console
-# build the image:
-$ docker build -t shellcheck .
+$ docker run \
+  -v /folder/with/my/scripts:/tmp \
+  -t caarlos0/shellcheck \
+  sh -c 'shellcheck /tmp/*.sh'
+```
+
+### Copy the binary to outside
 
-# run it locally against your scripts:
-$ docker run -v /folder/with/my/scripts:/tmp -t shellcheck sh -c 'shellcheck /tmp/*.sh'
+So you can use in it any ubuntu machine, travis machines, for example,
+as I do in [caarlos0/shell-ci-build](https://github.com/caarlos0/shell-ci-build).
 
-# copy the binary to outside, so it can be used in any ubuntu machine:
-$ docker run -v `pwd`:/tmp -t shellcheck cp -f /usr/bin/shellcheck /tmp/
+```
+$ docker run \
+  -v `pwd`:/tmp \
+  -t caarlos0/shellcheck \
+  cp -f /usr/bin/shellcheck /tmp/
+```
+
+### Build
+
+Not really needed unless you change something, as this repo is an automated Docker hub build.
+
+```console
+$ docker build -t caarlos0/shellcheck .
 ```