v0.900.4

This release upgrades @angular/language-service to v9.0.0-rc.8.
For a complete change log see here.

New features:

• Append symbol type to hover tooltip (#34515) (381b895)
• Show documentation on hover (#34506) (1660095)
• Add textmate grammar for template property bindings

Bug fixes:

• completions after "let x of |" in ngFor (#34473) (ca8b584)
• correctly parse expressions in an attribute (#34517) (7a0d6e7)
• pipe method should not include parentheses (#34485) (2845596)
• whitelist all html elements