Update Renovate config to combine all nonmajor updates into one pr. (#514)

Author: qwerzl

renovate.json

@@ -4,5 +4,18 @@
   ],
   "ignoreDeps": [
     "remark-math"
+  ],
+  "packageRules": [
+    {
+      "matchPackagePatterns": [
+        "*"
+      ],
+      "matchUpdateTypes": [
+        "minor",
+        "patch"
+      ],
+      "groupName": "all non-major dependencies",
+      "groupSlug": "all-minor-patch"
+    }
   ]
 }