v0.3.0

LinearElasticity v0.3.0

Diff since v0.2.1

Merged pull requests:

• New version: v0.2.1 (#40) (@singularitti)
• Deprecate ElasticModulus types, just use functions (#41) (@singularitti)
• Make names in src/Isotropic.jl but add aliases (#42) (@singularitti)
• Deprecate some aliases (#43) (@singularitti)