README: adapted version number

Author: proycon

README.md

@@ -4,7 +4,7 @@
 [![DOI](https://zenodo.org/badge/20526237.svg)](https://zenodo.org/badge/latestdoi/20526237)
 
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-TimblServer 1.15 (c) CLS/ILK/CLiPS 1998 - 2023
+TimblServer 1.18 (c) CLS/ILK/CLiPS 1998 - 2023
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     Tilburg Memory Based Learner -- Server