graphics/pencil3: Wrap README at 72 columns.

Signed-off-by: B. Watson <yalhcru@gmail.com>

graphics/pencil3/README

@@ -9,13 +9,14 @@ decide for yourself whether or not you think this is a good idea.
 Optional features:
 
 ELECTRON (default=no): This requires electron, available in SBo. Use
-pencil3 with some version of electron previously installed in the system.
-Otherwise the SlackBuild uses and downloads electron required for pencil3.
+pencil3 with some version of electron previously installed in the
+system.  Otherwise the SlackBuild uses and downloads electron required
+for pencil3.
 
-BINARY (default=no): Use it to create a binary package. This option requires
-downloading electron for the architecture of your system, close to 40MiB.
-You can install the electron package from SBo with the INSTALL_ZIP=yes option,
-to avoid the download.
+BINARY (default=no): Use it to create a binary package. This option
+requires downloading electron for the architecture of your system,
+close to 40MiB.  You can install the electron package from SBo with
+the INSTALL_ZIP=yes option, to avoid the download.
 
 If you need to use any option do something like: