fix(git): Changed git: url in install script to https: (#610)

git clone git://github.com/nodemailer/wildduck.git  =>
git clone https://github.com/nodemailer/wildduck.git

Author: hknfrt

docs/general/install.md

@@ -29,7 +29,7 @@ Assuming you have MongoDB and Redis running somewhere.
 #### Step 1\. Get the code from github
 
 ```
-$ git clone git://github.com/nodemailer/wildduck.git
+$ git clone https://github.com/nodemailer/wildduck.git
 $ cd wildduck
 ```
 
@@ -87,4 +87,4 @@ docker pull nodemailer/wildduck:1.20
 To run the docker image using the [default config](https://github.com/nodemailer/wildduck/blob/master/config/default.toml), and `mongodb` and `redis` from the host machine, use:
 ```
 docker run --network=host nodemailer/wildduck
-```
+```