Fix syntax in .travis.yml

.travis.yml

@@ -56,10 +56,10 @@ install:
     fi
   - if [ $ARCH = x86_64 ]; then
     if [ $TRAVIS_OS_NAME = linux ]; then
-    sudo apt install musl
+    sudo apt install musl;
     elif [ $TRAVIS_OS_NAME = osx ]; then
     brew tap altkatz/homebrew-gcc_cross_compilers;
-    brew install FiloSottile/musl-cross/musl-cross 
+    brew install FiloSottile/musl-cross/musl-cross;
     travis_wait brew install x64-elf-gcc;
     fi;
     fi