Add license, include, and repository metadata.

The include directive prevents the crate package from including all of
the test bam files.

The license and repository metadata are just good practice.

Cargo.toml

@@ -2,7 +2,11 @@
 name = "bamtofastq"
 version = "1.3.5"
 authors = ["Patrick Marks <patrick@10xgenomics.com>"]
+license = "MIT"
+repository = "https://github.com/10XGenomics/bamtofastq.git"
+
 edition = "2018"
+include = ["src/**/*", "LICENSE", "README.md"]
 resolver = "2"
 
 [dependencies]