be overly pedantic with ${}

because bash

.travis.yml

@@ -36,19 +36,19 @@ notifications:
 
 before_deploy:
  - sudo apt-get install nsis markdown dpkg rpm
- - DOTVERSION=`echo $TRAVIS_TAG | sed "s/-/\\./g"`
+ - DOTVERSION=`echo ${TRAVIS_TAG} | sed "s/-/\\./g"`
  - cd packaging
  - mkdir build
- - ./package-all.sh $TRAVIS_TAG $PWD/build/
+ - ./package-all.sh ${TRAVIS_TAG} ${PWD}/build/
 deploy:
   provider: releases
   api_key:
     secure: "cMC68erxuf0jb4Pe0sOH4m1f7I2LWPUatD9BC0WeZ9PwTnWOzrm0hnjZIES4TTKVo8WIfZIiCfxpdAFeoh6bomG2MsKwSKMc8qHGhfNGqPnyzYh6zdPZaA+4Q3TDQI3DrziyDnQUFeH1h/7UZLDLxtDrOtcYcGdNg5VjvV9fJ7g="
   file:
-    - build/OpenRA-$TRAVIS_TAG.exe
-    - build/OpenRA-$TRAVIS_TAG.zip
-    - build/openra-$DOTVERSION-1.noarch.rpm
-    - build/openra_$DOTVERSION_all.deb
+    - build/OpenRA-${TRAVIS_TAG}.exe
+    - build/OpenRA-${TRAVIS_TAG}.zip
+    - build/openra-${DOTVERSION}-1.noarch.rpm
+    - build/openra_${DOTVERSION}_all.deb
   skip_cleanup: true
   on:
     all_branches: true