Maven風ファイル名に変更

diff --git a/ChangeLog.txt b/CHANGELOG.txt
similarity index 100%
rename from ChangeLog.txt
rename to CHANGELOG.txt

diff --git a/License.txt b/LICENSE.txt
similarity index 100%
rename from License.txt
rename to LICENSE.txt

diff --git a/00README.txt b/README.txt
similarity index 100%
rename from 00README.txt
rename to README.txt