handcalcs v1.5.0

This update is to include changes added via PR that were (regrettably) not previously published to PyPI.

Big "Thank you!" to @daradib and @omouraenko for these:

• #103 - Fix: Round non-iterable objects with len method
• #105 - Fix: Copy exporter attribute instead of modifying parent class
• #108 - Fix: Round sympy expressions and nested elements
• #119 - Fix: Rendering issues in VS Code