Snap installation information

Installation information added (and a minor fix)
Signed-off-by: Ihor Dvoretskyi <ihor@linux.com>

README.md

@@ -43,6 +43,8 @@ If you want to use a package manager:
 - [Chocolatey](https://chocolatey.org/) users can use `choco install kubernetes-helm`.
 - [Scoop](https://scoop.sh/) users can use `scoop install helm`.
 - [GoFish](https://gofi.sh/) users can use `gofish install helm`.
+- [Snap](https://snapcraft.io/) users can use `sudo snap install helm
+  --classic`.
 
 To rapidly get Helm up and running, start with the [Quick Start Guide](https://docs.helm.sh/using_helm/#quickstart-guide).
 

docs/install.md

@@ -30,7 +30,7 @@ The Snap package for Helm is maintained by
 [Snapcrafters](https://github.com/snapcrafters/helm).
 
 ```
-$ sudo snap install helm --classic
+sudo snap install helm --classic
 ```
 
 ### From Homebrew (macOS)