Update mathbox (purescript#53)

Author: paf31

packages.json

@@ -2007,7 +2007,7 @@
         "unsafe-coerce"
       ],
       "repo": "https://github.com/rintcius/purescript-mathbox.git",
-      "version": "v0.1.0"
+      "version": "v0.2.0"
     },
     "maybe": {
         "dependencies": [