A number of small improvements (#3)

* Add --illumina option

This allows output FASTQs to be written according to Illumina file
naming standards.

* fix command line ordering in the usage

* Fix output FASTQ and do not require output directory to exist

* update README to remove in-line usage

* remove windows-latest from CI/CD

* Update cargo

* add license

.github/workflows/build_and_test.yml

@@ -63,7 +63,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macOS-latest, windows-latest]
+        os: [ubuntu-latest, macOS-latest]
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2