Update CHANGELOG. sourced requires go1.13

Signed-off-by: David Pordomingo <[email protected]>

Author: dpordomingo

CHANGELOG.md

@@ -18,6 +18,11 @@ The changes listed under `Unreleased` section have landed in master but are not
 
 - `sourced compose list` shows an index number for each compose entry, and `sourced compose set` now accepts both the name or the index number (@cmbahadir) ([#199](https://github.com/src-d/sourced-ce/issues/199)).
 
+### Internal
+
+- Development and building of source{d} CE requires now `go 1.13` ([#242](https://github.com/src-d/sourced-ce/pull/242))
+
+
 ## [v0.15.1](https://github.com/src-d/sourced-ce/releases/tag/v0.15.1) - 2019-08-27
 
 ### Fixed