Fix warnings (#225)

src/decoder/ifd.rs

@@ -1,7 +1,6 @@
 //! Function for reading TIFF tags
 
 use std::collections::HashMap;
-use std::convert::{TryFrom, TryInto};
 use std::io::{self, Read, Seek};
 use std::mem;
 use std::str;

src/decoder/image.rs

@@ -7,7 +7,6 @@ use crate::tags::{
     CompressionMethod, PhotometricInterpretation, PlanarConfiguration, Predictor, SampleFormat, Tag,
 };
 use crate::{ColorType, TiffError, TiffFormatError, TiffResult, TiffUnsupportedError, UsageError};
-use std::convert::TryFrom;
 use std::io::{self, Cursor, Read, Seek};
 use std::sync::Arc;
 

src/decoder/mod.rs

@@ -1,5 +1,4 @@
 use std::collections::{HashMap, HashSet};
-use std::convert::TryFrom;
 use std::io::{self, Read, Seek};
 use std::ops::Range;
 

src/decoder/stream.rs

@@ -1,6 +1,5 @@
 //! All IO functionality needed for TIFF decoding
 
-use std::convert::TryFrom;
 use std::io::{self, BufRead, BufReader, Read, Seek, Take};
 
 /// Byte order of the TIFF file.

src/decoder/tag_reader.rs

@@ -1,4 +1,3 @@
-use std::convert::TryFrom;
 use std::io::{Read, Seek};
 
 use crate::tags::Tag;