Update documented default semanticSort to false

The default value was updated to false [1] per suggestion [2].

[1] diffplug@10610f8
[2] diffplug#1709 (review)

plugin-maven/README.md

@@ -196,7 +196,7 @@ any other maven phase (i.e. compile) then it can be configured as below;
       <wildcardsLast>false</wildcardsLast> <!-- Optional, default false. Sort wildcard import after specific imports -->
       <order>java|javax,org,com,com.diffplug,,\#com.diffplug,\#</order>  <!-- or use <file>${project.basedir}/eclipse.importorder</file> -->
       <!-- you can use an empty string for all the imports you didn't specify explicitly, '|' to join group without blank line, and '\#` prefix for static imports. -->
-      <semanticSort>false</semanticSort> <!-- Optional, default true. Sort by package, then class, then member (for static imports). Splitting is based on common conventions (packages are lower case, classes start with upper case). Use <treatAsPackage> and <treatAsClass> for exceptions. -->
+      <semanticSort>false</semanticSort> <!-- Optional, default false. Sort by package, then class, then member (for static imports). Splitting is based on common conventions (packages are lower case, classes start with upper case). Use <treatAsPackage> and <treatAsClass> for exceptions. -->
       <treatAsPackage> <!-- Packages starting with upper case letters. -->
         <package>com.example.MyPackage</package>
       </treatAsPackage>