message: Update the dev environement build instructions for Windows
  We have moved from github to gitlab. Reflect that in the text
  for cloning the BU repository
diff: @@ -53,13 +53,13 @@ you need to customize to your local system settings.
  2. Switch to the directory where you want your copy of the source code to live.
  If the directory doesn't already exist, first create it.
  - `mkdir C:\BitcoinUnlimited\`
  + `mkdir C:\bitcoinunlimited\`
  - `cd C:\BitcoinUnlimited\`
  + `cd C:\bitcoinunlimited\`
  3. Clone the Bitcoin Unlimited repository with the following command:
  - `git clone https://github.com/BitcoinUnlimited/BitcoinUnlimited.git .`
  + `git clone https://gitlab.com/bitcoinunlimited/BCHUnlimited.git .`
  4. See section 5.2 below for setting the git path in the configuration file.
  