fix: increase min version of env_filter to 0.1.1

[andylokandy]

env_filter = 0.1.0 will not compile with the follwing errors:

error[E0599]: no method named `try_parse` found for struct `env_filter::Builder` in the current scope
   --> src/filter/env_filter.rs:194:17
    |
194 |         builder.try_parse(&config).ok()?;
    |                 ^^^^^^^^^
    |
help: there is a method `parse` with a similar name
    |
194 |         builder.parse(&config).ok()?;
    |                 ~~~~~

error[E0599]: no method named `try_parse` found for struct `env_filter::Builder` in the current scope
   --> src/filter/env_filter.rs:223:16
    |
223 |         self.0.try_parse(filters)?;
    |                ^^^^^^^^^
    |
help: there is a method `parse` with a similar name
    |
223 |         self.0.parse(filters)?;
    |                ~~~~~