[🔥AUDIT🔥] Target node 12 so we don't break folks that haven't upgrade…

…d yet (#29)

🖍 _This is an audit!_ 🖍

## Summary:
oops!
https://khanacademy.slack.com/archives/C02NMB1R5/p1650646528384399

Issue: XXX-XXXX

## Test plan:
run `npm run build`, and switch to node 12 w/ nvm or whatever you've got. `node ./dist/cli/run.js` should work, instead of crashing with a syntax error!
Switch back to node 16 and ensure that it also runs fine under 16.

Author: jaredly

Auditors: somewhatabstract

Required Reviewers:

Approved By:

Checks: ✅ Lint & Test (ubuntu-latest, 16.x)

Pull Request URL: #29

.babelrc

@@ -1,6 +1,6 @@
 {
 	"presets": [
 		"@babel/preset-flow",
-		["@babel/preset-env", { "targets": { "node": "16" } }]
+		["@babel/preset-env", { "targets": { "node": "12" } }]
 	]
 }

.changeset/blue-plants-develop.md

@@ -0,0 +1,5 @@
+---
+'@khanacademy/graphql-flow': patch
+---
+
+Compile for node 12 instead of 16