Implement v1 of asset downloading

Author: charlieegan3

go.mod

@@ -0,0 +1,8 @@
+module github.com/charlieegan3/fetch-release-binary
+
+go 1.16
+
+require (
+	github.com/google/go-github/v39 v39.0.0
+	golang.org/x/build v0.0.0-20210910204607-15e3ac06db6c
+)