ng new - wont allow dashes as the first param

[Adam-Kernig]

🐞 Bug report

- [ X ] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Is this a regression?

No

Description

Running ng new followed by a dash cased string will cause an error

🔬 Minimal Reproduction

ng new april-2019

🔥 Exception or Error

adamkernig$ ng new april-2019
? Would you like to add Angular routing? Yes
? Which stylesheet format would you like to use? CSS
Schematic input does not validate against the Schema: {"name":"april-2019","version":"7.3.8","routing":true,"style":"css"}
Errors:

  Data path ".name" should match format "html-selector".

🌍 Your Environment

Angular CLI: 7.3.8
Node: 10.15.0
OS: darwin x64
Angular: 
... 

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.13.8
@angular-devkit/core         7.3.8
@angular-devkit/schematics   7.3.8
@schematics/angular          7.3.8
@schematics/update           0.13.8
rxjs                         6.3.3
typescript                   3.2.4

[alan-agius4]

Duplicate of #13885

[clydin]

Just a quick note that the dash itself is not the problem but rather the presence of a number immediately following the dash.

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