Refine phrasing regarding mid-tier models in readme

Author: robertpiosik

README.md

@@ -34,7 +34,7 @@
 - tool calling limited to directory and file lookups
 - with its prompt simplicity:
   - less time is spent on 'thinking'
-  - coding with mid-tier models is viable
+  - mid-tier models are sufficiently capable
 
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