update docs

README.md

@@ -77,6 +77,7 @@ A simple Docker image to create certificate requests for web servers
 * Print md5 checksums:
   - For certificate: `openssl x509 -noout -modulus -in server.crt| openssl md5`
   - For key: `openssl rsa -noout -modulus -in privkey.pem| openssl md5`
+  - For CSR: `openssl req -noout -modulus -in server.csr| openssl md5`
 * Expiration:
   - Show expiration: `openssl x509 -noout -enddate -in server.crt`
   - Show all dates: `openssl x509 -noout -dates -in server.crt`