Hide the CA path in normal operation

Most users don't need to interact with it, and it's important they don't
share the rootCA-key.pem file, so let's not lead them there in the first
place. Advanced users can still use "mkcert -CAROOT".

Fixes FiloSottile#282

README.md

@@ -4,12 +4,11 @@ mkcert is a simple tool for making locally-trusted development certificates. It
 
 ```
 $ mkcert -install
-Created a new local CA at "/Users/filippo/Library/Application Support/mkcert" 💥
+Created a new local CA 💥
 The local CA is now installed in the system trust store! ⚡️
 The local CA is now installed in the Firefox trust store (requires browser restart)! 🦊
 
 $ mkcert example.com "*.example.com" example.test localhost 127.0.0.1 ::1
-Using the local CA at "/Users/filippo/Library/Application Support/mkcert" ✨
 
 Created a new certificate valid for the following names 📜
  - "example.com"

cert.go

@@ -261,8 +261,6 @@ func (m *mkcert) makeCertFromCSR() {
 func (m *mkcert) loadCA() {
 	if !pathExists(filepath.Join(m.CAROOT, rootName)) {
 		m.newCA()
-	} else {
-		log.Printf("Using the local CA at \"%s\" ✨\n", m.CAROOT)
 	}
 
 	certPEMBlock, err := ioutil.ReadFile(filepath.Join(m.CAROOT, rootName))
@@ -341,7 +339,7 @@ func (m *mkcert) newCA() {
 		&pem.Block{Type: "CERTIFICATE", Bytes: cert}), 0644)
 	fatalIfErr(err, "failed to save CA key")
 
-	log.Printf("Created a new local CA at \"%s\" 💥\n", m.CAROOT)
+	log.Printf("Created a new local CA 💥\n")
 }
 
 func (m *mkcert) caUniqueName() string {