Update README.md (#7)

Author: kreghek

README.md

@@ -24,6 +24,21 @@ This is the parameters list:
 - `--help`: Display this help screen.
 - `--version`: Display version information.
 
+### Detecting commit UUID
+
+On CI from Environment Variables:
+
+- CI_COMMIT
+- TRAVIS_PULL_REQUEST_SHA
+- TRAVIS_COMMIT
+- DRONE_COMMIT
+- CIRCLE_SHA1
+- CI_COMMIT_ID
+- WERCKER_GIT_COMMIT
+- CODEBUILD_RESOLVED_SOURCE_VERSION
+- SCRUTINIZER_SHA1
+- REVISION
+
 ### Windows w/ compressed archive
 
 ```ps