diff --git a/Cargo.lock b/Cargo.lock
index 595c12b..e69d97a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -807,6 +807,7 @@ dependencies = [
  "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "git2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "number_prefix 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "pretty_env_logger 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "reqwest 0.9.15 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1211,6 +1212,11 @@ dependencies = [
  "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "number_prefix"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "openssl"
 version = "0.10.20"
@@ -2428,6 +2434,7 @@ dependencies = [
 "checksum num-traits 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)" = "92e5113e9fd4cc14ded8e499429f396a20f98c772a47cc8622a736e1ec843c31"
 "checksum num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "0b3a5d7cc97d6d30d8b9bc8fa19bf45349ffe46241e8816f50f62f6d6aaabee1"
 "checksum num_cpus 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1a23f0ed30a54abaa0c7e83b1d2d87ada7c3c23078d1d87815af3e3b6385fbba"
+"checksum number_prefix 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "17b02fc0ff9a9e4b35b3342880f48e896ebf69f2967921fe8646bf5b7125956a"
 "checksum openssl 0.10.20 (registry+https://github.com/rust-lang/crates.io-index)" = "5a0d6b781aac4ac1bd6cafe2a2f0ad8c16ae8e1dd5184822a16c50139f8838d9"
 "checksum openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "77af24da69f9d9341038eba93a073b1fdaaa1b788221b00a69bce9e762cb32de"
 "checksum openssl-sys 0.9.43 (registry+https://github.com/rust-lang/crates.io-index)" = "33c86834957dd5b915623e94f2f4ab2c70dd8f6b70679824155d5ae21dbd495d"
diff --git a/Cargo.toml b/Cargo.toml
index a8c47ce..04169e7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,6 +12,7 @@ bytes = "0.4.12"
 futures = "0.1.25"
 git2 = "0.8.0"
 lazy_static = "1.3.0"
+number_prefix = "0.3.0"
 openssl-probe = "0.1.2"
 pretty_env_logger = "0.3.0"
 reqwest = "0.9.15"