Put TEST_TARGET env in quotes

.travis.yml

@@ -15,8 +15,8 @@ env:
     - secure: "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"
     - secure: "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"
   matrix:
-    - KARMA_BROWSERSTACK=1 COVERAGE=1 TEST_TARGET="test"
-    - KARMA_SAUCE_LABS=1 TEST_TARGET="test-assets"
+    - KARMA_BROWSERSTACK=1 COVERAGE=1 TEST_TARGET=test
+    - KARMA_SAUCE_LABS=1 TEST_TARGET=test-assets
 
 matrix:
   allow_failures:
@@ -36,7 +36,7 @@ before_script:
   - mkdir coverage
 
 script:
-  - make $(TEST_TARGET)
+  - make "$TEST_TARGET"
 
 after_success:
   - "[[ -n $COVERAGE ]] && make coverage"