Add CHANGELOG

CHANGELOG.md

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+# array_column() Changelog
+
+## 1.1.3
+
+_Released 2015-03-20_
+
+* Changing package name from "rhumsaa/array_column" to "ramsey/array_column"
+* Updated Travis CI build config to test more versions of PHP
+* Updated Travis CI config to lint and check PSR-2 coding standards
+* Added project badges
+* Added CHANGELOG
+
+## 1.1.2
+
+_Released 2013-07-22_
+
+* Remove unnecessary conditionals
+* Whitespace changes
+
+## 1.1.1
+
+_Released 2013-07-06_
+
+* Documentation updates
+
+## 1.1.0
+
+_Released 2013-07-06_
+
+* Catching up array_column() library functionality and tests with PHP 5.5.0
+* Set Travis CI to run tests on PHP 5.5
+
+## 1.0.0
+
+_Released 2013-03-22_
+
+* Initial release of userland library