Fix lineno offset in show_skipped

The line number is 0-based here, so add 1.

Author: blueyed

_pytest/skipping.py

@@ -377,4 +377,4 @@ def show_skipped(terminalreporter, lines):
                     reason = reason[9:]
                 lines.append(
                     "SKIP [%d] %s:%d: %s" %
-                    (num, fspath, lineno, reason))
+                    (num, fspath, lineno + 1, reason))