Rename all proposal plugins to -proposal- from -transform- (#6570)

packages/babel-plugin-proposal-function-sent/README.md

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+# @babel/plugin-proposal-function-sent
+
+> Compile the `function.sent` meta property, used inside generator functions, to valid ES2015 code.
+
+## Example
+
+```js
+function* generator() {
+    console.log("Sent", function.sent);
+    console.log("Yield", yield);
+}
+
+const iterator = generator();
+iterator.next(1); // Logs "Sent 1"
+iterator.next(2); // Logs "Yield 2"
+```
+
+Is compiled roughly to
+
+```js
+let generator = _skipFirstGeneratorNext(function* () {
+    const _functionSent = yield;
+    console.log("Sent", _functionSent);
+    console.log("Yield", yield);
+});
+
+const iterator = generator();
+iterator.next(1); // Logs "Sent 1"
+iterator.next(2); // Logs "Yield 1"
+```
+
+## Installation
+
+```sh
+npm install --save-dev @babel/plugin-proposal-function-sent
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["@babel/proposal-function-sent"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins @babel/proposal-function-sent script.js
+```
+
+### Via Node API
+
+```javascript
+require("@babel/core").transform("code", {
+  plugins: ["@babel/proposal-function-sent"]
+});
+```
+
+## References
+
+* [Proposal](https://github.com/allenwb/ESideas/blob/master/Generator%20metaproperty.md)