Revert "Update dependency atom-languageclient to v1 (#213)" (#217)

This reverts commit 0b13208.

Author: lgeiger

package.json

@@ -28,7 +28,7 @@
     "atom": ">=1.21.0 <2.0.0"
   },
   "dependencies": {
-    "atom-languageclient": "1.0.0"
+    "atom-languageclient": "0.9.9"
   },
   "devDependencies": {
     "mock-spawn": "0.2.6"