v0.7.0

What's Changed

• Fixed Spectrum inheritance and added @propertys #403 #404 #405 #406 #427 #426
• Python version modernization #375 #377 #382 #388 #390 #422 #424
• Improved code formatting #389 #393 #396 #398 #407 #418
• Improvements to Fitter class #378 #409 #412 #413 #414 #425
• Added liccheck #416
• Fix issues with data tools #379 #381 #419 #423
• Datetime-related changes #372 #374

Closed pull requests: https://github.com/lbl-anp/becquerel/milestone/9?closed=1

Full Changelog: v0.6.0...v0.7.0