feat: [email protected] support (#572)

Author: QuentinBrosse

.travis.yml

@@ -19,6 +19,10 @@ matrix:
       env:  TEST_WITH_REAL_API=0 GOTESTFLAGS="-race -cpu=1,2,4"
     - go:   "1.12"
       env:  TEST_WITH_REAL_API=1
+    - go:   "1.13"
+      env:  TEST_WITH_REAL_API=0 GOTESTFLAGS="-race -cpu=1,2,4"
+    - go:   "1.13"
+      env:  TEST_WITH_REAL_API=1
     - go:   tip
       env:  TEST_WITH_REAL_API=0 GOTESTFLAGS="-race -cpu=1,2,4"
   allow_failures: