Add snap.login to gitignore

This makes Travis CI Relese failed with the following command ``` release failed after 0.02s error=git is currently in a dirty state, please check in your pipeline what can be changing the following files: ?? snap.login ```
leopardslab · May 26, 2019 · e478149 · e478149
1 parent 2686efd
commit e478149
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/.gitignore b/.gitignore
@@ -32,3 +32,5 @@ coverage*
 
 # IDE files
 .idea/*
+
+snap.login