Bump gson from 2.8.5 to 2.8.6

Bumps gson from 2.8.5 to 2.8.6.

Changelog

Sourced from gson's changelog.

Version 2.8.6

2019-10-04 GitHub Diff

• Added static methods JsonParser.parseString and JsonParser.parseReader and deprecated instance method JsonParser.parse
• Java 9 module-info support

Commits

• 29c9389 [maven-release-plugin] prepare release gson-parent-2.8.6
• 21fc362 Fixed tests for java 11 (#1454)
• c188138 restored Java 9 build (#1586)
• 20dca86 Add docs to module-info.java (#1535)
• d6e6a01 Keep TypeAdapters from being stripped (#1546)
• 7845c38 Minor cleanups in deprecations and other warnings (#1522)
• 0e90771 Made the build work again with JDK 8 (#1585)
• 0409a2e Fix typo in UserGuide (#1572)
• 3958b1f Prefer writing chars instead of strings of length one (#1576)
• f885e60 Reverted the commit ce0fc4f34fe783ab685762341d61439fd5dc4670
• Additional commits viewable in compare view