deps: update various dependencies

We also increase the MSRV to 1.32, the current stable release, which sets
the stage for migrating to Rust 2018.

grep-searcher/Cargo.toml

@@ -14,16 +14,16 @@ license = "Unlicense/MIT"
 
 [dependencies]
 bytecount = "0.3.2"
-encoding_rs = "0.8.10"
+encoding_rs = "0.8.14"
 encoding_rs_io = "0.1.3"
 grep-matcher = { version = "0.1.1", path = "../grep-matcher" }
 log = "0.4.5"
-memchr = "2.0.2"
+memchr = "2.1"
 memmap = "0.6.2"
 
 [dev-dependencies]
 grep-regex = { version = "0.1.1", path = "../grep-regex" }
-regex = "1.0.5"
+regex = "1.1"
 
 [features]
 avx-accel = [