chore(build): add go1.15 build support

chenrui333 · web-flow · commit 60ffea591871 · 2020-08-15T15:16:10.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,6 +6,7 @@ dist: bionic
 go:
   - '1.13.x'
   - '1.14.x'
+  - '1.15.x'  
   - master
 
 script:
