Add alias gbl for forgit::blame in fish (#273)

Added the alias gbl for forgit::blame to the fish wrapper, so the behavior in fish is the same as in bash/zsh. I've also deleted an empty line where there were two in a row.

conf.d/forgit.plugin.fish

@@ -167,7 +167,6 @@ if test -z "$FORGIT_NO_ALIASES"
         alias gbd 'forgit::branch::delete'
     end
 
-
     if test -n "$forgit_clean"
         alias $forgit_clean 'forgit::clean'
     else
@@ -216,4 +215,10 @@ if test -z "$FORGIT_NO_ALIASES"
         alias grc 'forgit::revert::commit'
     end
 
+    if test -n "$forgit_blame"
+        alias $forgit_blame 'forgit::blame'
+    else
+        alias gbl 'forgit::blame'
+    end
+
 end