Attempt to force prettier to use lf for eol.

.gitattributes

@@ -1 +1 @@
-* text lf
+* text=auto eol=lf

package.json

@@ -319,6 +319,7 @@
     "vsce": "2.8.0"
   },
   "prettier": {
-    "printWidth": 120
+    "printWidth": 120,
+    "endOfLine": "lf"
   }
 }