Apply suggestion to soitool/compressor.py

soitool/compressor.py

@@ -30,7 +30,7 @@ def compress(obj):
 
 def decompress(lzma_compressed_json_string):
     """
-    Decompress a lzma compressed json string.
+    Decompress a lzma-compressed json string.
 
     Decompresses a json compatible python object which is casted from bytes to
     string.