Merge pull request #2 from astynax/master

A proper "repr" and the missed lock-file

Author: mokevnin

README.md

@@ -23,7 +23,7 @@ pip install hexlet-pairs
     >>> pairs.cdr(p)
     'foo'
     >>> print(pairs.to_string(p))
-    (42, 'foo')
+    cons(42, 'foo')
 
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