fix polythene version

bfa835e4 · Hermann · dc7e146d · bfa835e4
Commit bfa835e4 authored Feb 17, 2019 by Hermann
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
    "mithril-infinite": "^1.2.4",
    "polythene-core-css": "^1.2.0",
    "polythene-css": "^1.2.0",
-    "polythene-mithril": "^1.2.0",
+    "polythene-mithril": "1.2.0",
    "querystring": "^0.2.0",
    "showdown": "^1.9.0"
  },