Prepare release: update Issues

ISSUES.md

 ## A list of known (and hopefully soon solved) issues of ELPA ##
 
 For more details and recent updates please visit the online [issue system] (https://gitlab.mpcdf.mpg.de/elpa/elpa/issues)
+Issues which are not mentioned in a newer release are (considered as) solved
+
+### ELPA 2016.05.003 release  ###
+
+- the Fortran module file "precision" was installed as private. Lead to linking problems
 
 ### ELPA 2016.05.002 release  ###