fix source -> source code

README.md

@@ -1001,7 +1001,7 @@ See https://github.com/n1trux/awesome-sysadmin#metric--metric-collection
   * [Gigablast](http://www.gigablast.com/) - open source search engine. ([Demo](http://www.gigablast.com/), [Source Code](https://github.com/gigablast/open-source-search-engine)) `Apache` `C++`
   * [Searx](https://github.com/asciimoo/searx) - A privacy-respecting, hackable metasearch engine. ([Demo](https://searx.me/)) `AGPLv3` `Python`
   * [Seeks](https://beniz.github.io/seeks/) - A websearch proxy and collaborative distributed tool for websearch. `AGPLv3` `C++`
-  * [Yacy](http://yacy.net/en/index.html) - Peer based, decentralized search engine server. ([Demo](http://search.yacy.net/), [Source](https://github.com/yacy/yacy_search_server)) `GPLv2` `Java`
+  * [Yacy](http://yacy.net/en/index.html) - Peer based, decentralized search engine server. ([Demo](http://search.yacy.net/), [Source Code](https://github.com/yacy/yacy_search_server)) `GPLv2` `Java`
 
 
 ## Software Development