v0.7.0

• replaced crud macros with nearly identical functions

• removed FieldAccess

• changed update's api to be consistent with delete's

• implemented FieldType and FieldEq for url::Url

• added MaxStr field type

• added shorter syntax for Model::F.field: Model.field

• implemented condition collections for Option<impl Condition>

• ForeignModelByField does not cache a model instance anymore

• is_none and is_some conditions on Option<T> fields

• implementation of derive macros is available as normal function

• implemented Condition on Arc<dyn Condition> and &impl Condition

• relaxed / fixed lifetimes

• improved error spans in or! and and!

• fixed names of join aliases

• changed name generation for join and column aliases

• redesigned associated type Columns on trait FieldType

• replace field modifiers with const fns

• removed AsDbType

• removed support for async-std

• changed error type returned by Decoder methods