Merge branch 'master' of https://github.com/taoliu/MACS

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# especially if it merges an updated upstream into a topic branch.
#
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# the commit.

MACS2/OptValidator.py

@@ -95,7 +95,7 @@ def opt_validate ( options ):
     #    options.extsize = 2 * options.shiftsize
     #else:                               # if --shiftsize is not set
     #    options.shiftsize = options.extsize / 2
-    if options.extsize <= 1 :
+    if options.extsize < 1 :
         logging.error("--extsize must >= 1!")
         sys.exit(1)