Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/src/GvimExt/GvimExt.reg b/src/GvimExt/GvimExt.reg
index 8604244..2b8ebf0 100644
--- a/src/GvimExt/GvimExt.reg
+++ b/src/GvimExt/GvimExt.reg
@@ -15,6 +15,6 @@
 [HKEY_LOCAL_MACHINE\Software\Vim\Gvim]
    "path"="gvim.exe"
 
-[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\Vim 8.0]
-   "DisplayName"="Vim 8.0: Edit with Vim popup menu entry"
+[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\Vim 8.1]
+   "DisplayName"="Vim 8.1: Edit with Vim popup menu entry"
    "UninstallString"="uninstal.exe"