README: remove mentions of non-go-modules

This information is a bit outdated by now, and it's unlikely
for anyone to still be using go1.10 or older.

Signed-off-by: Sebastiaan van Stijn <[email protected]>

Author: thaJeztah

README.md

@@ -8,7 +8,7 @@ A collection of packages to augment `testing` and support common patterns.
 
 ## Usage
 
-With Go modules enabled (go1.11+)
+With Go modules enabled
 
 ```
 $ go get gotest.tools/v3
@@ -18,10 +18,6 @@ $ go get gotest.tools/v3
 import "gotest.tools/v3/assert"
 ```
 
-To use `gotest.tools` with an older version of Go that does not understand Go
-module paths pin to version `v2.3.0`.
-
-
 ## Packages
 
 * [assert](http://pkg.go.dev/gotest.tools/v3/assert) -