Update minimum required Go version to 1.16
Fixes
@@ -160,7 +160,7 @@ for other operating systems. These packages are not guaranteed to be up-to-date.
If your operating system does not have a binary release, but does run Go, you can build from source.
-Make sure that you have Go version 1.11 or greater and Go modules are enabled.
+Make sure that you have Go version 1.16 or greater and Go modules are enabled.
```
git clone https://github.com/zyedidia/micro
