docs(readme) mention opm in install section

thibaultcha · Jan 11, 2017 · 432dd16 · 432dd16
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diff --git a/README.md b/README.md
@@ -45,6 +45,12 @@ This binding can be installed via [Luarocks](https://luarocks.org):
 $ luarocks install argon2-ffi
 ```
 
+Or via [opm](https://github.com/openresty/opm):
+
+```
+$ opm get thibaultcha/lua-argon2-ffi
+```
+
 Or simply by copying the `src/argon2.lua` file in your `LUA_PATH`.
 
 [Back to TOC](#table-of-contents)