.travis.yml in smtpapi-0.1.6 vs .travis.yml in smtpapi-0.1.7

@@ -25,10 +25,10 @@
     rvm: '2.4'
     skip_cleanup: true
 
 notifications:
   slack:
-    if: branch = master
+    if: branch = main
     on_pull_requests: false
     on_success: never
     on_failure: change
     rooms:
       - secure: kyDurUDtXcp+6SfpFeszmzRZEpl2IOFqevGelhKVfx7j+M+p1wvPCkv9vnSdpKaZbQ80EKORxS4ZsnKUL9/yOP2uF9mrzB/DCfzFynw/IVfBejM8nkbf/CmosFh0SkkLuwotaPeqMhAtg1J8Avk1HVKJmihaJfkD6kzQ3PSyKlw=