add factor_iter() and iter() methods #69

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	name: CI

	jobs:
	ci:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	rust:
	- 1.36.0 # MSRV
	- stable
	- beta
	- nightly
	features:
	- ""
	- "serde"

	steps:
	- name: Checkout
	uses: actions/checkout@v3

	- name: Set up Rust
	uses: dtolnay/rust-toolchain@master
	with:
	toolchain: ${{ matrix.rust }}

	- name: MSRV dependencies
	if: matrix.rust == '1.36.0'
	run: \|
	cargo generate-lockfile
	cargo update -p serde_json --precise 1.0.99
	cargo update -p serde --precise 1.0.156
	cargo update -p quote --precise 1.0.30
	cargo update -p proc-macro2 --precise 1.0.65

	- name: Build (no_std)
	run: cargo build --no-default-features

	- name: Build
	run: cargo build --features "${{ matrix.features }}"

	- name: Test
	run: cargo test --features "${{ matrix.features }}"

	- name: Doc
	run: cargo doc --features "${{ matrix.features }}"

	clippy:
	name: Rustfmt and Clippy
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v3

	- name: Set up nightly Rust
	uses: dtolnay/rust-toolchain@nightly
	with:
	components: rustfmt, clippy

	- name: Rustfmt
	run: cargo fmt --all -- --check

	- name: Clippy
	run: cargo clippy # -- -D warnings

Provide feedback