Update README (#78)

diff --git a/README.md b/README.md
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 ## Versions of Software Used
 - Alpine 3.12.3
-- Apache Traffic Server 8.1.1
+- Apache Traffic Server 9.0.0
 - LuaJIT 2.0.4 / Lua 5.1.4
 - Go 1.15.6
 - Other Packages