blast view: informs users on the minimal length of query sequence to use (issue #180)

resources/views/blast/welcome.blade.php

@@ -24,7 +24,7 @@
         {{ html()->label('Select the blast task') }}
         {{ html()->select('blasttask', ['blastn-short' => 'blastn-short', 'blastn' => 'blastn', 'tblastn' => 'tblastn'],  'blastn-short') }}
         <br> <br>
-        {{ html()->label('Paste below your query sequence') }}
+        {{ html()->label('Paste below your query sequence (must be at least 7bp-long)') }}
         <br> <br>
         {{ html()->textarea('queryseq', null, ['class' => 'form-control'])->rows(20)->cols(100) }}
     </div>