Oops: It's RegTP, not RegPT ...

diff --git a/certs/RegPT-4R.pem b/certs/RegTP-4R.pem
similarity index 100%
rename from certs/RegPT-4R.pem
rename to certs/RegTP-4R.pem

diff --git a/certs/RegPT-5R.pem b/certs/RegTP-5R.pem
similarity index 100%
rename from certs/RegPT-5R.pem
rename to certs/RegTP-5R.pem

diff --git a/certs/RegPT-6R.pem b/certs/RegTP-6R.pem
similarity index 100%
rename from certs/RegPT-6R.pem
rename to certs/RegTP-6R.pem