Update README.md

Author: nbashir97

README.md

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-`effectsize` is the first comprehensive Python package for computing effect sizes (ESs), also known as standardized differences. The package implements the methodology outlined by [Yang and Dalton, 2012][yang2012] and it provides complex functionality, such as the ability to deal with skewed variables, multinomial categories, and weighted statistics.
+`effectsize` is a comprehensive Python package for computing effect sizes (ESs), also known as standardized differences. The package implements the methodology outlined by [Yang and Dalton, 2012][yang2012] and it provides complex functionality, such as the ability to deal with skewed variables, multinomial categories, and weighted statistics.
 
 ## Prerequisites