Update dependency org.hamcrest:hamcrest-core to v3

This MR contains the following updates:

Package	Type	Update	Change
org.hamcrest:hamcrest-core (source)	test	major	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 MR #​411 for details. Developers who use Java 1.7 earlier can still depend upon hamcrest-2.2.jar.

Improvements

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

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