Update README.md

Author: GCuser99

README.md

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 # SolverWrapper
-[twinBASIC](https://twinbasic.com/preview.html) ActiveX DLL for automating MS Excel's Solver
+A [twinBASIC](https://twinbasic.com/preview.html) ActiveX DLL for automating MS Excel's Solver
 
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)