Update the supported list of libraries with versions.

README.md

@@ -12,15 +12,19 @@ select the correct conversion library to perform the job itself.
 
 Support for the following libraries is included:
 
-- Sharp
-- Gifsicle
-- JpegTran
-- Inkscape
-- OptiPNG
-- Pngquant
-- Pngcrush
-- SvgFilter
-- GraphicsMagick (install "gm" module)
+```
+- Gifsicle (npm install gifsicle-stream@^1.0.0)
+- GraphicsMagick (npm install gm-papandreou@^1.23.0-patch1)
+- Inkscape (npm install inkscape@^3.0.0)
+- JpegTran (npm install jpegtran@^2.0.0)
+- OptiPNG (npm install optipng@^2.1.0)
+- Pngcrush (npm install pngcrush@^2.0.1)
+- Pngquant (npm install pngquant@^3.0.0)
+- Sharp (npm install sharp@~0.28.0)
+- SvgFilter (npm install svgfilter@^4.1.0)
+```
+
+> callers must install the libraries and if present they will be enabled
 
 ## Introduction