Update CHANGELOG.md

Author: sven1103

CHANGELOG.md

@@ -1,6 +1,6 @@
 # nf-core/tools: Changelog
 
-##[v1.3](https://github.com/nf-core/tools/releases/tag/1.3) - 2018-11-21
+## [v1.3](https://github.com/nf-core/tools/releases/tag/1.3) - 2018-11-21
 * `nf-core create` command line interface updated
     * Interactive prompts for required arguments if not given
     * New flag for workflow author