Fixed typings

packages/grafana-ui/package.json

@@ -24,6 +24,7 @@
     "react-popper": "^1.3.0",
     "react-transition-group": "^2.2.1",
     "react-virtualized": "^9.21.0",
+    "tether": "^1.4.0",
     "tether-drop": "https://github.com/torkelo/drop/tarball/master",
     "tinycolor2": "^1.4.1"
   },
@@ -35,6 +36,8 @@
     "@types/react": "^16.7.6",
     "@types/react-custom-scrollbars": "^4.0.5",
     "@types/react-test-renderer": "^16.0.3",
+    "@types/tether-drop": "^1.4.8",
+    "@types/tinycolor2": "^1.4.1",
     "react-test-renderer": "^16.7.0",
     "typescript": "^3.2.2"
   }