Fix derp in changelog for tagged builds

Author: divadsn

app/build.gradle

@@ -6,7 +6,7 @@ def getChangelog = { ->
     if (commitRange) {
         if (System.getenv("TRAVIS_TAG")) {
             def tag = System.getenv("TRAVIS_TAG")
-            commitRange = 'git describe --abbrev=0 --tags $TRAVIS_TAG^'.execute().text.trim() + '...' + tag
+            commitRange = ('git describe --abbrev=0 --tags ' +  tag + '^').execute().text.trim() + '...' + tag
         }
 
         def stdout = new ByteArrayOutputStream()

scripts/changelog.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env sh
 MERGE_PREFIX="Merge pull request"
 
-if [[ ! -z $TRAVIS_TAG ]]
+if [ ! -z "$TRAVIS_TAG" ]
 then
     TRAVIS_COMMIT_RANGE="$(git describe --abbrev=0 --tags $TRAVIS_TAG^)...$TRAVIS_TAG"
 fi