tweak README

README.md

 bedtools - a swiss army knife for genome arithmetic         
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-**Current version**: 2.19.0
+**Current version**: 2.19.1
 
 Note
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@@ -9,6 +9,8 @@ Stable release for bedtools were formerly archived on Google Code. Unfortunately
 downloads facility is shutting down; so henceforth, all source code and stable releases will be 
 maintained via this Github repository.
 
+**Full documentation**:  http://bedtools.readthedocs.org
+
 Summary
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 Collectively, the bedtools utilities are a swiss-army knife of tools for a wide-range of genomics analysis tasks. The most widely-used tools enable genome arithmetic: that is, set theory on the genome. For example, bedtools allows one to intersect, merge, count, complement, and shuffle genomic intervals from multiple files in widely-used genomic file formats such as BAM, BED, GFF/GTF, VCF.