Bump 1.0.0 deprecations

[hadley]

From deprecate_warn() to deprecate_stop()

1.0.0 was released in August 2019.

[hadley]

Should mean we can delete compat-lazyeval.R

[hadley]

Given recent twitter discussion this is probably too aggressive — better to wait until 2024.

[DavisVaughan]

Can we move to deprecate_warn(always = TRUE)?

[hadley]

@DavisVaughan for sure