docs(changelogs): add a title header to the changelogs

Cryptophobia · Cryptophobia · commit 2b2310299ace · 2018-11-29T12:16:23.000-05:00
diff --git a/src/changelogs/v2.19.0.md b/src/changelogs/v2.19.0.md
@@ -1,3 +1,4 @@
+## Workflow v2.18.0 -> v2.19.0
 
 #### Releases
 
diff --git a/src/changelogs/v2.20.0.md b/src/changelogs/v2.20.0.md
@@ -1,3 +1,4 @@
+## Workflow v2.19.0 -> v2.20.0
 
 #### Releases
 
