README.md: add missing dot.
@@ -76,7 +76,7 @@ command from within the shell.
*selfupdate cannot be used for version 0.4.x and under. A fresh
[installation](#installation) is needed.*
-*Version 0.7.0 requires a forced update. Please run `selfupdate -f`*
+*Version 0.7.0 requires a forced update. Please run `selfupdate -f`.*
## Notable Features
StaSh has a pile of features that are expected from a real shell. These
