Prepare 0.4.0 (#57)

* don't patch url templates if cli arguments aren't provided

* update changelog

* Prepare 0.4.0

* Update CHANGELOG.md

Author: atrakh

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 All notable changes to the ld-find-code-refs program will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
-## Master
+## [0.4.0] - 2019-01-30
 
 ### Added
 - Added support for relative paths to CLI `-dir` parameter.

build/package/circleci/orb.yml

@@ -33,7 +33,7 @@ executors:
       LD_HUNK_URL_TEMPLATE: << parameters.hunk_url_template >>
       LD_DEFAULT_BRANCH: << parameters.default_branch >>
     docker:
-      - image: launchdarkly/ld-find-code-refs:0.3.0
+      - image: launchdarkly/ld-find-code-refs:0.4.0
 commands:
   find-flags:
     steps: