Update Changelog.
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+2017-08-05:
+ Tagged v3.0.0.
+ Due to the directory rename switching to a new version number.
+
+2017-03-04:
+ Avoid negative shift. Fixes #41.
+
+2016-11-17:
+ Support RISC-V.
+
+
+2016-09-10:
+ Add fPIC flag on x86_64 if the compiler supports it. Fixes #34.
+
+2015 and 2016:
+ Lots of improvements to the build system.
+
+2015:
+ Warning fixes.
+
2015-05-19:
Rename 'src' directory to 'double-conversion'.