v0.0.9

Great work done by @GerjanDorgelo 😃

What's Changed

• Add formula 8.21 for anchorage length and corresponding tests by @GerjanDorgelo in #390
• Add formulas 5.21 to 5.27 for structural analysis in NEN-EN 1992-1-1+… by @GerjanDorgelo in #392
• 395 feature request add formulas from chapter 5873 from nen en 1992 1 1 by @GerjanDorgelo in #396
• 397 feature request add formulas from chapter 5882 from nen en 1992 1 1 by @GerjanDorgelo in #398
• 399 feature request add formulas from chapter 5883 from nen en 1992 1 1 by @GerjanDorgelo in #400
• 401 feature request add formulas from chapter 589 from nen en 1992 1 1 by @GerjanDorgelo in #402
• 403 feature request add formulas from chapter 5.9 from nen-en-1992-1-1 by @GerjanDorgelo in #405

Full Changelog: v0.0.8...v0.0.9