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Implement `->` operator

It looks like you just created this project, and its perfect timing for me as I need a way to query json data. The only thing missing for that is support for the -> operator in postgres, to allow filtering data based on specific fields in the json data. Do you have any plans to add that?

Example from the postgres docs:

Query: '{"a": {"b":"foo"}}'::json->'a'

Result: {"b":"foo"}

Update to diesel 2.0

When changing the version to 2.0, the build fails with

> rustup run stable cargo build
    Updating crates.io index
   Compiling version_check v0.9.4
   Compiling syn v1.0.107
   Compiling serde v1.0.152
   Compiling proc-macro-error-attr v1.0.4
   Compiling proc-macro-error v1.0.4
   Compiling serde_derive v1.0.152
   Compiling diesel_derives v2.0.1
   Compiling serde_json v1.0.91
   Compiling diesel v2.0.3
   Compiling diesel_json v0.1.1 (/home/jayvdb/rust/diesel_json)
warning: #[sql_type] attribute form is deprecated
  = help: use `#[diesel(sql_type = sql_types::Jsonb)]` instead

warning: #[sql_type] attribute form is deprecated
  = help: use `#[diesel(sql_type = sql_types::Jsonb)]` instead

error[E0107]: this struct takes 1 generic argument but 2 generic arguments were supplied
  --> src/lib.rs:84:38
   |
84 |         out: &mut diesel::serialize::Output<W, Pg>,
   |                                      ^^^^^^    -- help: remove this generic argument
   |                                      |
   |                                      expected 1 generic argument
   |
note: struct defined here, with 1 generic parameter: `DB`
  --> /home/jayvdb/.cargo/registry/src/github.com-1ecc6299db9ec823/diesel-2.0.3/src/serialize.rs:35:12
   |
35 | pub struct Output<'a, 'b, DB>
   |            ^^^^^^         --

For more information about this error, try `rustc --explain E0107`.

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