Create CHANGELOG.md

Author: jophde

CHANGELOG.md

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+# Optimizely Android X SDK Changelog
+
+### 0.1.3
+October 27, 2016
+
+*Bug Fixes*
+- Now service intervals can be changed after they are scheduled the first time.
+  - If a service is scheduled when rescheduling the old service will be unscheduled.
+- Now multiple `OptimizelyManager`instances can be created for multiple Optimizely X projects.
+  - A manager builds `AndroidOptimizely` for the project id it was created with and only that that project id.
+  - Could run one project in your activites and one in your services.
+- Now shows user experiment record logs.
+- Turns on more core logs.
+
+*New Features*
+- *Exponential Backoff.* Datafile download event dispatching now exmploy exponential backoff.