chore: upgrade prettier

for `import type` and `export type` support

Author: aleclarson

.prettierrc

@@ -1,4 +1,5 @@
 {
+  "arrowParens": "avoid",
   "jsxBracketSameLine": true,
   "printWidth": 80,
   "semi": false,

package.json

@@ -78,7 +78,7 @@
     "lerna": "3.15.0",
     "meta": "^1.2.19",
     "mock-raf": "npm:@react-spring/mock-raf",
-    "prettier": "1.19.1",
+    "prettier": "^2.0.5",
     "pretty-quick": "1.10.0",
     "react": "~16.9.0",
     "recrawl-sync": "^1.2.2",