.travis.yml: Trigger Travis on all branches

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index 1381ffc..b3d54d3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,8 @@
+# Disable bors on the bors temp branch
 branches:
-  only:
-    # This is where pull requests from "bors r+" are built.
-    - staging
-    # This is where pull requests from "bors try" are built.
-    - trying
+  except:
+    - staging.tmp
+    - trying.tmp
 
 language: rust
 rust: