Add changelog

CHANGELOG

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+1.4.0:
+- Support for regexp matching resource titles, like:
+   File[~titleregexp]
+- More tests
+- Only require JSON gem when actually needed
+- Allow empty queries (returns all hosts)
+- Don't require pluginsync to run on master
+- Fix strftime call on old ruby versions
+- Improve facts query output
+- Support single quoted strings in queries as well as double quoted