Update and rename DeveloperGuide_1.3.md to DeveloperGuide_1.3.0.md

ファイル名修正
DeveloperGuide_1.3.md
　－＞　DeveloperGuide_1.3.0.md
Merge pull request #3 from KSKtakamatsu/patch-2

Update and rename DeveloperGuide_1.3.md to DeveloperGuide_1.3.0.md