v0.3.7

Ferrite v0.3.7

Diff since v0.3.6

Merged pull requests:

• Update the heat equation example (#460) (@fredrikekre)
• Improvements to hyperelasticity example (#461) (@fredrikekre)
• Fix tests for WriteVTK 1.14.3 which uses 64-bit integers in the output. (#462) (@fredrikekre)