Update release notes for 4.0.18

Author: adangel

ReleaseNotes.md

@@ -7,7 +7,7 @@ Eclipse Update Site:
 *   Releases: <https://dl.bintray.com/pmd/pmd-eclipse-plugin/updates/>
 *   Snapshots: <https://dl.bintray.com/pmd/pmd-eclipse-plugin/snapshots/updates/>
 
-## ????: 4.0.17.v????
+## ????: 4.0.18.v????
 
 ### New and noteworthy
 
@@ -16,14 +16,24 @@ Eclipse Update Site:
 ### Fixed Issues
 
 *   [#48](https://github.com/pmd/pmd-eclipse-plugin/issues/48): Upgrade to PMD 6.3.0
-*   [#52](https://github.com/pmd/pmd-eclipse-plugin/issues/52): Eclipse Internal Error - Out of Memory
-*   [#57](https://github.com/pmd/pmd-eclipse-plugin/pull/57): De-duplicate project ruleset when loading the project properties
 
 ### External Contributions
 
 *   [#53](https://github.com/pmd/pmd-eclipse-plugin/pull/53): README: markdown, fix links - [Lars Hvam](https://github.com/larshp)
 
 
+## 01-August-2018: 4.0.17.v20180801-1551
+
+### New and noteworthy
+
+*   This is only a bugfix release.
+
+### Fixed Issues
+
+*   [#52](https://github.com/pmd/pmd-eclipse-plugin/issues/52): Eclipse Internal Error - Out of Memory
+*   [#57](https://github.com/pmd/pmd-eclipse-plugin/pull/57): De-duplicate project ruleset when loading the project properties
+
+
 ## 12-April-2018: 4.0.16.v20180412-0833
 
 ### New and noteworthy