chore(package): update text-buffer to version 12.1.2

Author: greenkeeper[bot]

package.json

@@ -17,7 +17,7 @@
     "blue-tape": "^1.0.0",
     "onchange": "^3.2.1",
     "tap-spec": "^4.1.1",
-    "text-buffer": "12.1.1",
+    "text-buffer": "12.1.2",
     "ts-node": "^3.0.3",
     "tslint": "^5.2.0",
     "tslint-config-typings": "^0.3.1",