Exclude ruby-2.3.7 w/ rails edge from travis testing (#1539)
Exclude ruby-2.3.7 w/ rails edge from travis testing (#1539)

rails edge doesn't support ruby-2.3, so it always a failure
rossta/webpacker,rails/webpacker,rossta/webpacker,gauravtiwari/webpacker,gauravtiwari/webpacker,rossta/webpacker,rails/webpacker,rossta/webpacker,gauravtiwari/webpacker