Update build-lambda-zip instructions for Windows (#251)

This should mitigate the dependency locking issues people have been reporting
aws · Nov 21, 2019 · d89e42d · d89e42d
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commit d89e42d
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diff --git a/README.md b/README.md
@@ -54,6 +54,7 @@ Windows developers may have trouble producing a zip file that marks the binary a
 
 Get the tool
 ``` shell
+set GO111MODULE=on
 go.exe get -u github.com/aws/aws-lambda-go/cmd/build-lambda-zip
 ```