update changelog for 1.42.2

Author: etpinard

CHANGELOG.md

@@ -10,6 +10,16 @@ https://github.com/plotly/plotly.js/compare/vX.Y.Z...master
 where X.Y.Z is the semver of most recent plotly.js release.
 
 
+## [1.42.2] -- 2018-11-01
+
+### Fixed
+- Fix runaway loops for `scattergl` lines and fill traces
+  (bug introduced in 1.42.0) [#3199]
+- Fix size and alignment vertical modebar [#3193]
+- Fix legend item rendering for traces with typed array marker
+  settings [#3192]
+
+
 ## [1.42.1] -- 2018-10-31
 
 ### Fixed