Clarify readme

readme.md

 This version is only compatible with docxtemplater version 2
 
-The v1 has added two mandatory arguments: `opts.getImage` and `opts.getSize`. See Usage (v1)
+The version 1 of this module has added two mandatory arguments: `opts.getImage` and `opts.getSize`. See Usage
 
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 Installation:
 =============
 
-You will need docxtemplater v1: `npm install docxtemplater`
+You will need docxtemplater version 2: `npm install docxtemplater`
 
 install this module: `npm install docxtemplater-image-module`
 
-Usage (v1)
-==========
+Usage
+=====
 
 Your docx should contain the text: `{%image}`