Bump gson from 2.6.2 to 2.8.6

[dependabot-preview]

Bumps gson from 2.6.2 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

Version 2.8.5

2018-05-21 GitHub Diff

• Print Gson version while throwing AssertionError and IllegalArgumentException
• Moved utils.VersionUtils class to internal.JavaVersion. This is a potential backward incompatible change from 2.8.4
• Fixed issue google/gson#1310 by supporting Debian Java 9

Version 2.8.4

2018-05-01 GitHub Diff

• Added a new FieldNamingPolicy, LOWER_CASE_WITH_DOTS that mapps JSON name someFieldName to some.field.name
• Fixed issue google/gson#1305 by removing compile/runtime dependency on sun.misc.Unsafe

Version 2.8.3

2018-04-27 GitHub Diff

• Added a new API, GsonBuilder.newBuilder() that clones the current builder
• Preserving DateFormatter behavior on JDK 9
• Numerous other bugfixes

Version 2.8.2

2017-09-19 GitHub Diff

• Introduced a new API, JsonElement.deepCopy()
• Numerous other bugfixes

Version 2.8.1

2017-05-30 GitHub Diff

• New: JsonObject.keySet()
• @JsonAdapter annotation can now use JsonSerializer and JsonDeserializer as well.

Version 2.8

2016-10-26 GitHub Diff

• New: TypeToken.getParameterized() and TypeToken.getArray() make it easier to register or look up a TypeAdapter.
• New: @JsonAdapter(nullSafe=true) to specify that a custom type adapter handles null.

Version 2.7

2016-06-14 GitHub Diff

• Added support for JsonSerializer/JsonDeserializer in @JsonAdapter annotation
• Exposing Gson properties excluder(), fieldNamingStrategy(), serializeNulls(), htmlSafe()
• Added JsonObject.size() method
• Added JsonWriter.value(Boolean value) method
• Using ArrayDeque, ConcurrentHashMap, and other JDK 1.6 features
• Better error reporting
• Plenty of other bug fixes

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

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