Fix warnings (#225)

src/encoder/compression/deflate.rs

@@ -1,6 +1,5 @@
-use crate::{encoder::compression::*, tags::CompressionMethod};
+use crate::encoder::compression::*;
 use flate2::{write::ZlibEncoder, Compression as FlateCompression};
-use std::io::Write;
 
 /// The Deflate algorithm used to compress image data in TIFF files.
 #[derive(Debug, Clone, Copy)]

src/encoder/compression/lzw.rs

@@ -1,5 +1,4 @@
-use crate::{encoder::compression::*, tags::CompressionMethod};
-use std::io::Write;
+use crate::encoder::compression::*;
 use weezl::encode::Encoder as LZWEncoder;
 
 /// The LZW algorithm used to compress image data in TIFF files.

src/encoder/compression/packbits.rs

@@ -1,5 +1,5 @@
-use crate::{encoder::compression::*, tags::CompressionMethod};
-use std::io::{BufWriter, Error, ErrorKind, Write};
+use crate::encoder::compression::*;
+use std::io::{BufWriter, Error, ErrorKind};
 
 /// Compressor that uses the Packbits[^note] algorithm to compress bytes.
 ///

src/encoder/compression/uncompressed.rs

@@ -1,5 +1,4 @@
-use crate::{encoder::compression::*, tags::CompressionMethod};
-use std::io::Write;
+use crate::encoder::compression::*;
 
 /// The default algorithm which does not compress at all.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]