fix(directline): remove unused files

Author: harshithkashyap

.gitignore

@@ -2,3 +2,4 @@
 /dist
 /lib
 /node_modules
+/built

__tests__/happy.uploadAttachments.js

@@ -113,4 +113,4 @@ describe('Happy path', () => {
       ]);
     });
   });
-});
+});

directLine.js

@@ -10,4 +10,4 @@ module.exports = {
   transform: {
     '^.+\\.[jt]sx?$': 'babel-jest'
   }
-};
+};