v1.6.pre1

• fix issue relaton/relaton-bib#34

v1.5.0

• fix issue relaton/relaton-bib#31
• bump new version

v1.5.pre

• Trim XML data by language

v1.4.0

• update grammar
• update README

v1.3.0

• issue relaton/relaton-bib#28

v1.2.0

• update grammar

v1.1.0

• release gem