Drop 1.7 and 1.8 support

oschwald · oschwald · commit 80f114f5ec64 · 2019-09-01T15:15:05.000-07:00
sync.Map was introduced in 1.9. 1.8 was EOL'd a year and half ago.
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,6 @@
 language: go
 
 go:
-  - 1.7
-  - 1.8
   - 1.9
   - "1.10"
   - 1.11

-Original file line number
+Diff line change
@@ @@ -1,8 +1,6 @@ @@
 language: go
 go:
 -  - 1.7
 -  - 1.8
   - 1.9
   - "1.10"
   - 1.11