Test versions of Go > 1.7

Author: suzmue

.travis.yml

@@ -3,6 +3,8 @@ sudo: false
 
 matrix:
   include:
+    - go: "1.7"
+    - go: "1.8"
     - go: "1.9"
     - go: "1.10"
     - go: "tip"

README.md

@@ -8,7 +8,7 @@ errcheck is a program for checking for unchecked errors in go programs.
 
     go get -u github.com/kisielk/errcheck
 
-errcheck requires Go 1.9 or newer and depends on the package go/packages from the golang.org/x/tools repository.
+errcheck requires Go 1.7 or newer and depends on the package go/packages from the golang.org/x/tools repository.
 
 ## Use
 
@@ -94,7 +94,7 @@ no arguments.
 
 ## Cgo
 
-Currently errcheck is unable to check packages that import "C" due to limitations in the importer.
+Currently errcheck is unable to check packages that import "C" due to limitations in the importer when used with versions earlier than Go 1.11.
 
 However, you can use errcheck on packages that depend on those which use cgo. In order for this to work you need to go install the cgo dependencies before running errcheck on the dependent packages.