Fix float to float32 for Golang

[themaxi]

Description

My XSD contains xs:float type:

<xs:element type="xs:float" name="Mark"/>

Generates to:

Mark                      *Float                     `xml:"Mark"`

After this fix it generates to

Mark                      float32                     `xml:"Mark"`

Types of changes

• [ ] Docs change / refactoring / dependency upgrade
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

[xuri]

LGTM, thanks for your PR.