Update dependency org.hamcrest:hamcrest-core to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.hamcrest:hamcrest-core (source)	2.2 -> 3.0

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Release Notes

hamcrest/JavaHamcrest (org.hamcrest:hamcrest-core)

v3.0

Compare Source

Breaking Changes

• From version 3.0, the jar distributed to Maven Central is now compiled to Java 1.8 bytecode,
  and is not compatible with previous versions of Java. See
  Issue #​331 and
  PR #​411 for details. Developers who use Java 1.7 earlier can still
  depend upon hamcrest-2.2.jar.

Improvements

• FileMatchersTest simplification (PR #​389)
• License cleanup (PR #​414,
  PR #​415, see also
  #​264,
  #​355,
  #​396,and
  #​399)

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