Update README.md

Author: ATPs

README.md

@@ -15,7 +15,7 @@ It is updated to support the [human Genome assembly T2T-CHM13v2.0](https://www.n
 
 **[For more running examples, visit the example folder](/examples/) and the [test_output folder](/test_output/).**
 
-# [PrecisionProDB online](https://precisionprodb.genes.fun/)
+## [PrecisionProDB online](https://precisionprodb.genes.fun/)
 PrecisionProDB is [now available here](https://precisionprodb.genes.fun/) for faster checking of effect of variants in protein sequences. Users may also upload a small tsv/tsv.gz file to use the pre-defined gene models.
 
 # Table of Contents