deps: require peer nexus 12-rc.13 and up

This is to support the nexus transition prisma-labs/graphql-framework-experiment#373. Nexus 0.12.0-rc.13 includes a typegen feature that makes it work even
after the package rename to @nexus/schema

BREAKING CHANGE:

- Installs will now receive warnings when depending on versions of nexus
  less than 0.12.0-rc.13.

package.json

@@ -30,7 +30,7 @@
   "peerDependencies": {
     "@prisma/client": "^2.0.0-preview022",
     "graphql": "^14.5.0",
-    "nexus": "^0.12.0-rc"
+    "nexus": "^0.12.0-rc.13"
   },
   "devDependencies": {
     "@prisma/cli": "^0.1.31",
@@ -54,7 +54,7 @@
     "graphql-yoga": "^1.18.3",
     "jest": "^25.1.0",
     "jest-watch-typeahead": "^0.4.0",
-    "nexus": "^0.12.0-rc.9",
+    "nexus": "^0.12.0-rc.13",
     "node-fetch": "^2.6.0",
     "prettier": "^1.17.1",
     "prisma2": "^2.0.0-preview022",

yarn.lock

@@ -5412,10 +5412,10 @@ [email protected]:
   resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.2.tgz#feacf7ccf525a77ae9634436a64883ffeca346fb"
   integrity sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw==
 
-nexus@^0.12.0-rc.9:
-  version "0.12.0-rc.9"
-  resolved "https://registry.yarnpkg.com/nexus/-/nexus-0.12.0-rc.9.tgz#b97a9d23ebcad5349bb42035d7d02d0da55a9c6c"
-  integrity sha512-YiWCQJ9y6p9QPzmI/fQ0/+xfpXOo6S+gKD58dxSrDDO5TD01VqoN8HzGvgIGoLstmO/U5ecNdl02Dwj/RiKVsQ==
+nexus@^0.12.0-rc.13:
+  version "0.12.0-rc.13"
+  resolved "https://registry.yarnpkg.com/nexus/-/nexus-0.12.0-rc.13.tgz#f6696b4d903e7c2a12b56875b122c8003be1ba31"
+  integrity sha512-RugEHXQyQXYg1i0PX0y9T/ZXliJidOnlmJxl4OeDqxedWM5QEl2qSA6Y0cOyd7p+xFh4y37zlDVh/nXw8LMnHg==
   dependencies:
     iterall "^1.2.2"
     tslib "^1.9.3"