Bump hamcrest-library from 1.3 to 2.1

Bumps [hamcrest-library](https://github.com/hamcrest/JavaHamcrest) from 1.3 to 2.1.
- [Release notes](https://github.com/hamcrest/JavaHamcrest/releases)
- [Changelog](https://github.com/hamcrest/JavaHamcrest/blob/master/CHANGES.md)
- [Commits](hamcrest/JavaHamcrest@hamcrest-java-1.3...v2.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-support

build.gradle

@@ -66,7 +66,7 @@ dependencies {
     compile group: 'org.freemarker', name: 'freemarker', version: '2.3.23'
 
     testCompile group: 'junit', name: 'junit', version: '4.12'
-    testCompile group: 'org.hamcrest', name: 'hamcrest-library', version: '1.3'
+    testCompile group: 'org.hamcrest', name: 'hamcrest-library', version: '2.1'
     testCompile group: 'org.mockito', name: 'mockito-core', version: '2.0.96-beta'
     testCompile group: 'org.skyscreamer', name: 'jsonassert', version: '1.3.0'
     testCompile group: 'org.jsoup', name: 'jsoup', version: '1.10.2'