Fixed a linting issue.. Ooops.

tools/shovill/shovill.xml

@@ -50,7 +50,7 @@
         </conditional>
         <param name="trim" argument="--trim" type="boolean" truevalue="--trim" falsevalue="" label="Trim reads" help="Use Trimmomatic to remove common adaptors first (default: OFF)" />
         <param name="log" type="boolean" label="Output log file?" checked="true" help="Return the Shovill log file as part of the output. Default is on" />
-        <param name="assembler" arguement="--assembler" type="select" label="Assembler to use" help="Which assembler would you like shovill to use, default is Spades">
+        <param name="assembler" argument="--assembler" type="select" label="Assembler to use" help="Which assembler would you like shovill to use, default is Spades">
             <option value="skesa">skesa</option>
             <option value="megahit">megahit</option>
             <option value="velvet">velvet</option>