bump versions

Add convenience impls for common types (#137)

* Work

* Tweak

* Fmt

* Work

* Format + typo fixes

* `no-std` fix

temp remove dev-dependencies

chore: Release ark-r1cs-std version 0.4.0-alpha.3

chore: Release ark-r1cs-std version 0.4.0-alpha.2

(cargo-release) ark-r1cs-std version 0.3.1

Release v0.3.0 (#66)

* Release v0.3.0

* fix the pr template

(cargo-release) ark-r1cs-std version 0.2.0