Polish

Author: gregorgorjanc

extern/README.md

@@ -163,9 +163,10 @@ cp -i extern/tskit/c/subprojects/kastore/kastore.c RcppTskit/src/tskit/.
 Commit changes:
 
 ```
+git diff
 git status
 git add RcppTskit/inst/include/tskit
 git add RcppTskit/src
-git commit -m "Update tskit C API to version 1.3.0"
+git commit -m "Update tskit C API to version 1.3.1"
 git push
 ```