Changing the number of provided plugins.

The number of provided plugins was outdated.

README.md

@@ -6,7 +6,7 @@ Copyright © 2004–, Kohsuke Kawaguchi, Sun Microsystems, Inc., and a number of
 
 About
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-In a nutshell Jenkins CI is the leading open-source continuous integration server. Built with Java, it provides over 300 plugins to support building and testing virtually any project.
+In a nutshell Jenkins CI is the leading open-source continuous integration server. Built with Java, it provides over 930 plugins to support building and testing virtually any project.
 
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