Merge commit 'ec4b28d83ef6d22deca08250e5fcfd67ae0da9ef'

* commit 'ec4b28d83ef6d22deca08250e5fcfd67ae0da9ef':
  Changelog
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History.md

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+# 4.0.0
+
+## Breaking changes
+
+ * Node.js v4 has reached it's end of life, so we no longer support it. It's v6+ or later.
+ * We now use ES6 in the browser code, too.
+    * If you're using Browserify or Webpack to package code for Internet Explorer, you will also have to use Babel.
+    * The pre-built node_modules/superagent.js is still ES5-compatible.
+
+## Minor changes
+
+ * Throw if `req.abort().end()` is called
+ * Throw if using unsupported mix of send and field
+ * Reject `.end()` promise on all error events (Kornel Lesiński)
+ * Set `https.servername` from the `Host` header (Kornel Lesiński)
+ * Leave backticks unencoded in query strings where possible (Ethan Resnick)
+ * Update node-mime to 2.x (Alexey Kucherenko)
+ * Allow default buffer settings based on response-type (shrey)
+
+# 3.8.3 (2018-04-29)
+
+ * Add flags for 201 & 422 responses (Nikhil Fadnis)
+ * Emit progress event while uploading Node `Buffer` via send method (Sergey Akhalkov)
+ * Fixed setting correct cookies for redirects (Damien Clark)
+ * Replace .catch with ['catch'] for IE9 Support (Miguel Stevens)
+
 # 3.8.2 (2017-12-09)
 
  * Fixed handling of exceptions thrown from callbacks