message: Remove note about panicking in get_field docs
  Since get_field rely on calling get on the underlying InnerSchema HashMap
  it shouldn't fail if the field was not found, it simply returns None.
diff: @@ -178,15 +178,7 @@ impl Schema {
  SchemaBuilder::default()
  }
  - /// Returns the field options associated with a given name.
  - ///
  - /// # Panics
  - /// Panics if the field name does not exist.
  - /// It is meant as an helper for user who created
  - /// and control the content of their schema.
  - ///
  - /// If panicking is not an option for you,
  - /// you may use `get(&self, field_name: &str)`.
  + /// Returns the field option associated with a given name.
  pub fn get_field(&self, field_name: &str) -> Option<Field> {
  self.0.fields_map.get(field_name).cloned()
  }
  