Remove TypeScript types build step

This makes it so until we are ready to flip the switch on adding types, there won't be conflicting Typescript definitions for users that are using `@types/hls.js`.

scripts/travis.sh

@@ -13,7 +13,6 @@ if [ "${TRAVIS_MODE}" = "build" ]; then
   echo "travis_fold:start:build"
   npm run type-check
   npm run build
-  npm run build:types
   echo "travis_fold:end:build"
   echo "travis_fold:start:docs"
   npm run docs