chore: sync with go1.15.15

Author: ldez

internal/cache/cache.go

@@ -109,7 +109,7 @@ const (
 // GODEBUG=gocacheverify=1.
 var verify = false
 
-var errVerifyMode = errors.New("gocachevrify=1")
+var errVerifyMode = errors.New("gocacheverify=1")
 
 // DebugTest is set when GODEBUG=gocachetest=1 is in the environment.
 var DebugTest = false

internal/cache/readme.md

@@ -2,6 +2,7 @@
 
 Extracted from `go/src/cmd/go/internal/cache/`.
 
+- sync with go1.15.15
 - sync with go1.14.15
 
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