Replace "<=" by "≤" in msgcheck help and README

Author: flashcode

README.adoc

@@ -72,7 +72,7 @@ options.
 
 The script returns exit code *0* if all files checked are OK
 (0 errors or option `--extract` given) or it returns *N*: number of files with
-errors (1 <= N <= 255).
+errors (1 ≤ N ≤ 255).
 
 == Example
 

msgcheck/msgcheck.py

@@ -59,7 +59,7 @@ def msgcheck_parser():
 
 The script returns:
   0: all files checked are OK (or --extract/--only-misspelled given)
-  n: number of files with errors (1 <= n <= 255)
+  n: number of files with errors (1 ≤ n ≤ 255)
 ''')
     parser.add_argument('-c', '--no-compile', action='store_true',
                         help='do not check compilation of file')