Fixes for REAL and DATE attribute definitions

What's Changed

• Fix: parsing ATTRIBUTE-DEFINITION-REAL default values by @simonas-drauksas-sensmetry in #210
• Feature: parsing ATTRIBUTE-DEFINITION-DATE default values by @simonas-drauksas-sensmetry in #211

New Contributors

• @simonas-drauksas-sensmetry made their first contribution in #210

Full Changelog: 0.0.48...0.0.49