Rename repository to PSCloudFlare to be consistent with Module name casing

[leojonathanoh]

Rename the repository to PSCloudFlare to be consistent with Module name casing.

This tripped me on *nix (where folders are case sensitive), when I did a git clone and used Import-Module:

PS > git clone https://github.com/zloeber/PSCloudflare
PS > Import-Module ./PSCloudflare
Import-module : The specified module './PSCloudflare' was not loaded because no valid module file was found in any module directory.
At line:1 char:7
+ $pwd; Import-module "./PSCloudflare"
+       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : ResourceUnavailable: (./PSCloudflare:String) [Import-Module], FileNotFoundException
+ FullyQualifiedErrorId : Modules_ModuleNotFound,Microsoft.PowerShell.Commands.ImportModuleCommand

PS > Import-Module ./PSCloudflare/PSCloudFlare.psm1 
# Okay

If the repository was consistent with the module's name casing, it would be:

PS > git clone https://github.com/zloeber/PSCloudFlare
PS > Import-Module ./PSCloudFlare
# Good

It's not a big deal, but hopefully people dont run into the same issues.