Add changelog file

Author: halirutan

CHANGELOG.md

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+# 4.16.0.4
+
+- Improve loading time of the package. After the first loading of Rubi (takes up to one or more minutes), the complete
+package is now stored in a binary format that allows to load Rubi in under a second
+- Remove global `Int` definitions before loading Rubi to avoid shadow warning message
+
+# 4.16.0.3
+
+- Fix issue where the display of Steps does not work on Mathematica version 7/8
+
+# 4.16.0.2
+
+- Latest integration rules from Albert
+- Fix that building the Mathematica page from the integration notebooks keeps semantics and verify it by running the test-suite