Generate changelog for v1.2.16

Author: pamil

CHANGELOG-1.2.md

@@ -0,0 +1,11 @@
+## CHANGELOG FOR `1.2.x`
+
+### v1.2.16 (2019-02-26)
+
+#### TL;DR
+
+- The first release after splitting the bundle to be a standalone package with its own release cycle.
+
+#### Details
+
+- [#10](https://github.com/Sylius/SyliusThemeBundle/issues/10) Set up Travis CI for 1.1 ([@pamil](https://github.com/pamil))