[#52] Adjust CHANGELOG.md to format supported by Chandler

To be able to synchronize it with GitHub release notes.

CHANGELOG.md

@@ -1,4 +1,6 @@
-0.8.0 - 2017-04-08
+# gradle-nexus-staging-plugin changelog
+
+## 0.8.0 - 2017-04-08
 
  - Auto drop repository after release - [#37](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/37)
  - Rename "promote" operation to "release" - [#50](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/50)
@@ -9,44 +11,44 @@
 **Deprecation note**. The ~~promoteRepository~~ and ~~closeAndPromoteRepository~~ tasks are marked as deprecated and will be removed
 in the one of the future versions. `releaseRepository` and `closeAndReleaseRepository` can be used as drop-in replacements. 
 
-0.7.0 - 2017-03-27
+## 0.7.0 - 2017-03-27
 
  - Verify that repository has been really closed - [#21](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/21)
  - Re-enable sharing stagingRepositoryId between close and promote - [#46](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/46)
  - Basic functional tests with different Gradle versions - [#41](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/41)
  - Suggest longer timeout if failed on time related operations even without `--info` enabled - [#34](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/34) 
  - Longer default retry period  - [#12](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/12)
 
-0.6.1 - 2017-03-20
+## 0.6.1 - 2017-03-20
 
  - Reusing `stagingRepositoryId` from close task bypasses retry mechanism and fails - [#44](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/44) - reusing `stagingRepositoryId` is temporary disabled
 
-0.6.0 - 2017-03-19
+## 0.6.0 - 2017-03-19
 
  - Consider state trying to find just one repository in given state - [#36](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/36) - contribution by [strelok1](https://github.com/strelok1)
  - Better error message in case of HTTP request failure - [#5](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/5) - contribution by [deanhiller](https://github.com/deanhiller)
  - Add EditorConfig configuration to better deal with spaces vs tabs - [#33](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/33)
 
-0.5.3 - 2015-06-13
+## 0.5.3 - 2015-06-13
 
  - `packageGroup` should be taken from project.group by default - [#11](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/11)
 
-0.5.2 - 2015-06-09
+## 0.5.2 - 2015-06-09
 
  - Provide single task to close and promote repository - [#9](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/9)
  - `getStagingProfile` task should display output without `--info` switch - [#8](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/8)
 
-0.5.1 - 2015-03-08
+## 0.5.1 - 2015-03-08
 
  - Credentials should be automatically fetched from configured deployer - [#7](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/7)
  - Credentials should be automatically fetched from Gradle properties (when available) - [#6](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/6)
 
-0.5.0 - 2015-03-02
+## 0.5.0 - 2015-03-02
 
  - Wait given time period when repositories are not yet available - [#3](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/3)
  - Use configured stagingProfileId when available - [#2](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/2)
  - nexusUrl by default should use Sonatype OSSRH - [#1](https://github.com/Codearte/gradle-nexus-staging-plugin/issues/1)
 
-0.4.0 - 2015-02-27
+## 0.4.0 - 2015-02-27
 
  - Initial release