Build master branch too.

.travis.yml

@@ -3,26 +3,26 @@ language: rust
 matrix:
   include:
     #- env: TARGET=x86_64-unknown-linux-gnu
-    #  if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
+    #  if: (branch = staging OR branch = trying OR branch = master) OR (type = pull_request AND branch = master)
 
     #- env: TARGET=riscv32imac-unknown-none-elf
-    #  if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
+    #  if: (branch = staging OR branch = trying OR branch = master) OR (type = pull_request AND branch = master)
 
     #- env: TARGET=x86_64-unknown-linux-gnu
     #  rust: beta
-    #  if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
+    #  if: (branch = staging OR branch = trying OR branch = master) OR (type = pull_request AND branch = master)
 
     #- env: TARGET=riscv32imac-unknown-none-elf
     #  rust: beta
-    #  if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
+    #  if: (branch = staging OR branch = trying OR branch = master) OR (type = pull_request AND branch = master)
 
     - env: TARGET=x86_64-unknown-linux-gnu
       rust: nightly
-      if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
+      if: (branch = staging OR branch = trying OR branch = master) OR (type = pull_request AND branch = master)
 
     - env: TARGET=riscv32imac-unknown-none-elf
       rust: nightly
-      if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
+      if: (branch = staging OR branch = trying OR branch = master) OR (type = pull_request AND branch = master)
 
 before_install: set -e