fix: clippy lint for deriving eq

We can do this since we don't have any non-eq types, and clippy is
telling us to do so

Author: simonrw

CHANGELOG.md

@@ -10,6 +10,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 * Support for boolean header card values
 
 ### Changed
+
+* Some more types are deriving `Eq` thanks to a clippy lint
+
 ### Removed
 
 ## [0.20.0]

fitsio/src/hdu.rs

@@ -14,7 +14,7 @@ use std::ffi;
 use std::ops::Range;
 
 /// Struct representing a FITS HDU
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Eq)]
 pub struct FitsHdu {
     /// Information about the current HDU
     pub info: HduInfo,
@@ -1031,7 +1031,7 @@ Otherwise the variant is `HduInfo::TableInfo`.
 [fetch-hdu-info]: ../fitsfile/struct.FitsFile.html#method.fetch_hdu_info
 */
 #[allow(missing_docs)]
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Eq)]
 pub enum HduInfo {
     ImageInfo {
         shape: Vec<usize>,

fitsio/src/tables.rs

@@ -420,7 +420,7 @@ pub struct ColumnDescription {
 }
 
 /// Concrete representation of the description of a column
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub struct ConcreteColumnDescription {
     /// Name of the column
     pub name: String,