Add acknowledgement

Author: sjl

acknowledgements.markdown

@@ -20,11 +20,11 @@ requests, pointed out typos, raised issues, and otherwise contributed:
 * [flatcap](https://github.com/flatcap)
 * [helixbass](https://bitbucket.org/helixbass)
 * [hoelzro](https://github.com/hoelzro)
+* [jlmuir](https://bitbucket.org/jlmuir/)
 * [jrib](https://github.com/jrib)
 * [lheiskan](https://github.com/lheiskan)
 * [lightningdb](https://github.com/lightningdb)
 * [manojkumarm](https://github.com/manojkumarm)
-* [manojkumarm](https://github.com/manojkumarm)
 * [markscholtz](https://github.com/markscholtz)
 * [marlun](https://github.com/marlun)
 * [mattsacks](https://github.com/mattsacks)