Add attribution to highlighting definitions coming from #144

Author: siegfriedpammer

ThirdParty-Highlightings/README.md

@@ -6,8 +6,8 @@ We are sharing them here, because we cannot include every possible language in t
 
 If you want your highlighting included, please open a pull request.
 
-* [RPG](https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_73/rbam6/rbam6clmain.htm) see RPGLE.xshd
-* [CLLE](https://www.ibm.com/developerworks/ibmi/library/i-ibmi-rpg-support/index.html) see CLLE.xshd
+* [RPG](https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_73/rbam6/rbam6clmain.htm) see RPGLE.xshd (provided by @worksofliam in #144)
+* [CLLE](https://www.ibm.com/developerworks/ibmi/library/i-ibmi-rpg-support/index.html) see CLLE.xshd (provided by @worksofliam in #144)
 
 Highlighting Definitions found in other locations
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