fix: make minor fixes to README

README.md

@@ -1,23 +1,22 @@
-# `krust`
+# `krust`: counts k-mers, written in rust
 
-## Counts k-mers, written in rust
-
-`krust` is a [k-mer](https://en.wikipedia.org/wiki/K-mer) counter - a bioinformatics 101 tool for counting the frequency of substrings of length `k` within strings of DNA data. `krust` is written in Rust and run from the command line. It takes a fasta file of DNA sequences and will output all canonical k-mers (the double helix means each k-mer has a [reverse complement](https://en.wikipedia.org/wiki/Complementarity_(molecular_biology)#DNA_and_RNA_base_pair_complementarity)) and their frequency across all records in the given data. `krust` is tested for accuracy against [jellyfish](https://github.com/gmarcais/Jellyfish).
+`krust` is a [k-mer](https://en.wikipedia.org/wiki/K-mer) counter - a bioinformatics 101 tool for counting the frequency of substrings of length `k` within strings of DNA data. `krust` is written in Rust and run from the command line. It takes a FASTA file of DNA sequences and will output all canonical k-mers (the double helix means each k-mer has a [reverse complement](https://en.wikipedia.org/wiki/Complementarity_(molecular_biology)#DNA_and_RNA_base_pair_complementarity)) and their frequency across all records in the given data. `krust` is tested for accuracy against [jellyfish](https://github.com/gmarcais/Jellyfish).
 
 ```bash
-Usage: krust <k> <path> [reader]
+krust: counts k-mers, written in rust
+
+Usage: krust <k> <path>
 
 Arguments:
-  <k>       provides k length, e.g. 5
-  <path>    path to a FASTA file, e.g. /home/lisa/bio/cerevisiae.pan.fa
-  [reader]  select *rust-bio* or *needletail* as FASTA reader [default: rust-bio]
+  <k>     provides k length, e.g. 5
+  <path>  path to a FASTA file, e.g. /home/lisa/bio/cerevisiae.pan.fa
 
 Options:
   -h, --help     Print help information
   -V, --version  Print version information
 ```
 
-`krust` supports either `rust-bio` or `needletail` to read fasta record. Use the `--features` flag to select.  
+`krust` supports either `rust-bio` or `needletail` to read FASTA record. Use the `--features` flag to select.  
 
 Run `krust` with `rust-bio`'s fasta reader to count *5*-mers like this: