Update version strings

src/resources/Info.plist

 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleGetInfoString</key>
-	<string>Typica 1.8.0</string>
+	<string>Typica 1.8.1</string>
 	<key>CFBundleSignature</key>
 	<string>@TYPEINFO@</string>
 	<key>CFBundleExecutable</key>
 	<key>CFBundleDisplayName</key>
 	<string>Typica</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.8.0</string>
+	<string>1.8.1</string>
 	<key>CFBundleVersion</key>
-	<string>1.8.0</string>
+	<string>1.8.1</string>
 	<key>NSHumanReadableCopyright</key>
 	<string>© 2007–2017 Neal Wilson</string>
 </dict>

src/resources/html/about.html

 				<h2>Support Ongoing Development</h2>
 				<p>While Typica is free to download, use, and modify, keeping this software available, maintained, and continuing with ongoing development in the form of new features and bug fixes is not without cost. If you find value in using Typica, please consider supporting this work financially.</p>
 				
-				<p><a href="https://typica.us/payment.html">Click here for more details.</a></p>
+				<p>For more details, <a href="https://typica.us/payment.html">visit https://typica.us/payment.html</a>.</p>
 			</div>
 		</div>
 	</body>

src/typica.rc

 #include <winver.h>
 VS_VERSION_INFO	VERSIONINFO
-FILEVERSION 	1,8,0,0
-PRODUCTVERSION 	1,8,0,0
+FILEVERSION 	1,8,1,0
+PRODUCTVERSION 	1,8,1,0
 FILEFLAGSMASK	0x3fL
 #ifdef _DEBUG
 	FILEFLAGS	VS_FF_DEBUG
 		BLOCK "040904b0"
 		BEGIN
 			VALUE "CompanyName", "Wilson's Coffee & Tea\0"
-			VALUE "FileDescription", "Typica 1.8.0\0"
-			VALUE "FileVersion", "1.8.0\0"
+			VALUE "FileDescription", "Typica 1.8.1\0"
+			VALUE "FileVersion", "1.8.1\0"
 			VALUE "InternalName", "Typica\0"
 			VALUE "LegalCopyright", "Copyright 2007-2017 Neal Evan Wilson\0"
 			VALUE "OriginalFilename", "Typica.exe\0"
 			VALUE "ProductName", "Typica\0"
-			VALUE "ProductVersion", "1.8.0\0"
+			VALUE "ProductVersion", "1.8.1\0"
 		END
 	END
 	BLOCK "VarFileInfo"

src/typica.w

 \mark{\noexpand\nullsec0{A Note on Notation}}
 \def\pn{Typica}
 \def\filebase{typica}
-\def\version{1.8.0 \number\year-\number\month-\number\day}
+\def\version{1.8.1 \number\year-\number\month-\number\day}
 \def\years{2007--2017}
 \def\title{\pn{} (Version \version)}
 \newskip\dangerskipb