Upgrade versions of vendored libs

vendor/github.com/kr/pretty/pretty.go

@@ -75,7 +75,7 @@ func Printf(format string, a ...interface{}) (n int, errno error) {
 
 // Println pretty-prints its operands and writes to standard output.
 //
-// Calling Print(x, y) is equivalent to
+// Calling Println(x, y) is equivalent to
 // fmt.Println(Formatter(x), Formatter(y)), but each operand is
 // formatted with "%# v".
 func Println(a ...interface{}) (n int, errno error) {