Fixes ANSI escape in headers

.gitignore

@@ -8,3 +8,4 @@ lib64/
 *.zip
 docs/_build
 .coverage
+.mypy_cache/

setup.py

@@ -6,7 +6,7 @@ setup(
     # Versions should comply with PEP440.  For a discussion on single-sourcing
     # the version across setup.py and the project code, see
     # https://packaging.python.org/en/latest/single_source_version.html
-    version='0.6.0',
+    version='0.6.1',
 
     description='Pretty console printing of tabular data',
     long_description='''Formatted console printing of tabular data.

tableprint.py

@@ -132,7 +132,7 @@ def header(headers, width=WIDTH, style=STYLE, add_hr=True):
     tablestyle = styles[style]
 
     # string formatter
-    data = map(lambda x: ('{:^%d}' % width).format(x), headers)
+    data = map(lambda x: ('{:^%d}' % (width + _ansi_len(x))).format(x), headers)
 
     # build the formatted str
     headerstr = _format_line(data, tablestyle.row)