Add column names

Author: kaizu

README.md

@@ -1,7 +1,7 @@
 E-Cell System version 4
 =======================
 
-|   |  |
+| Theme | Status |
 | ------------- | ------------- |
 | Conda package for Windows, Mac and Linux | [![Conda Version](https://img.shields.io/conda/vn/conda-forge/ecell4_base.svg)](https://github.com/conda-forge/ecell4_base-feedstock) |
 | PyPI (wheel) package for Linux | [![PyPI](https://img.shields.io/pypi/v/ecell4_base.svg)](https://pypi.python.org/pypi/ecell4_base) |