Update README.md

Author: bassoy

README.md

@@ -7,7 +7,7 @@ High-Performance Tensor-Matrix Multiplication Library (TTM)
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 ## Summary
-**TTM** is C++ high-performance tensor-matrix multiplication **header-only library**
+**TTM** is C++ high-performance tensor-matrix multiplication **header-only library**.
 It provides free C++ functions for parallel computing the **mode-`q` tensor-times-matrix product** of the general form
 
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