Travis: fixing yaml syntax

.travis.yml

@@ -76,9 +76,9 @@ script:
   - ${CMAKE_DIR}cmake -G Ninja -DWASM_LLVM_CONFIG=$TRAVIS_BUILD_DIR/ext/wasm-compiler/bin/llvm-config -DSecp256k1_ROOT_DIR=$TRAVIS_BUILD_DIR/ext -DBINARYEN_ROOT=$TRAVIS_BUILD_DIR/ext/wasm-compiler -DCMAKE_PREFIX_PATH=$TRAVIS_BUILD_DIR/ext $EOS_CMAKE_OPTIONS ..
   - ninja -j4
   - tests/eosd_run_test.sh
-  - [ "$TRAVIS_OS_NAME" == "osx" ] || tests/chain_test
-  - [ "$TRAVIS_OS_NAME" == "osx" ] || tests/slow_test
+  - '[ "$TRAVIS_OS_NAME" == "osx" ] || tests/chain_test'
+  - '[ "$TRAVIS_OS_NAME" == "osx" ] || tests/slow_test'
   - tests/api_test
-  - [ "$TRAVIS_OS_NAME" == "osx" ] || tests/p2p_tests/sync/test.sh
+  - '[ "$TRAVIS_OS_NAME" == "osx" ] || tests/p2p_tests/sync/test.sh'
   - tests/p2p_tests/sync/test.sh -p 2 -d 10
-  - [ "$TRAVIS_OS_NAME" == "osx" ] || tests/eosd_run_mongodb_test.sh
+  - '[ "$TRAVIS_OS_NAME" == "osx" ] || tests/eosd_run_mongodb_test.sh'