Error Prone 2.4.0

Support for latest JDK versions: Error Prone is now compatible with JDK 8 through JDK 14, as well as early access builds of JDK 15.

New checks:

• AutoValueSubclassLeaked
• CacheLoaderNull
• CheckedExceptionNotThrown
• CollectionUndefinedEquality
• ConstantPatternCompile
• DefaultPackage
• EmptyCatch
• FieldCanBeStatic
• ForEachIterable
• FromTemporalAccessor
• IdentityHashMapBoxing
• IgnoredPureGetter
• InlineFormatString
• InvalidLink
• LockOnBoxedPrimitive
• LossyPrimitiveCompare
• MisusedDayOfYear
• MutablePublicArray
• NonCanonicalType
• NullOptional
• ProtectedMembersInFinalClass
• PublicConstructorForAbstractClass
• RedundantCondition
• StaticAssignmentInConstructor
• StronglyTypeTime
• SuppressWarningsWithoutExplanation
• TruthGetOrDefault
• UnnecessarilyFullyQualified
• UrlInSee

Fixed issues: #1070, #1106, #1107, #1110, #1111, #1187, #1208, #1239, #1265, #1428, #1432, #1433, #1439, #1444, #1447, #1449, #1451, #1454, #1455, #1458, #1462, #1473, #1491, #1531, #1558, #1565, #1570, #1573, #1586, #1587, #1590, #1591, #1602, #1606, #1609, #1624, #776, #785, #930