Update README.md

update release number for links on this page

README.md

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 The purpose of this repository is to distribute binary executable programs for MODFLOW and related programs that will run on Windows, Mac, and Linux operating systems.  Executables for these different operating systems can be found under the [release](https://github.com/MODFLOW-USGS/executables/releases) tab above and are named:
 
-* [win64.zip](https://github.com/MODFLOW-USGS/executables/releases/download/6.0/win64.zip)
-* [win32.zip](https://github.com/MODFLOW-USGS/executables/releases/download/6.0/win32.zip)
-* [mac.zip](https://github.com/MODFLOW-USGS/executables/releases/download/6.0/mac.zip)
-* [linux.zip](https://github.com/MODFLOW-USGS/executables/releases/download/6.0/linux.zip)
+* [win64.zip](https://github.com/MODFLOW-USGS/executables/releases/download/7.0/win64.zip)
+* [win32.zip](https://github.com/MODFLOW-USGS/executables/releases/download/7.0/win32.zip)
+* [mac.zip](https://github.com/MODFLOW-USGS/executables/releases/download/7.0/mac.zip)
+* [linux.zip](https://github.com/MODFLOW-USGS/executables/releases/download/7.0/linux.zip)
 
 The programs, version numbers, and the date stamp on the downloaded file used to create the executables for the present release are