Azsecrets

This could be breaking change if you are using Azure KeyVault SDK <4.0.0, stick to `azsecrets==1.1` if so.

**Update**

- Added support for `azure-keyvault-secrets` version 4.

**Breaking Change**

- For the sake of consistency, all secrets that have `-` in them is converted to `_` when using CLI - 10

**Fixes**

- PowerShell environment should be in double quotes - 8

**Changes**

- PowerShell secret names `-` will be converted to `_` (6 )
- Class variables moved to method for `get_secrets([])` (7 )
- Readme update (4 )

**Features**

- Added ability to put in comma-separated names to get multiple secrets keys (2)

**Bugs**

- Wrong environment names were being used, corrected it (5)
- f-string removed to support Python 3.5 (1)

v1