Bump num-bigint from 0.2.6 to 0.4.0 (#46)

Bumps [num-bigint](https://github.com/rust-num/num-bigint) from 0.2.6 to 0.4.0.
- [Release notes](https://github.com/rust-num/num-bigint/releases)
- [Changelog](https://github.com/rust-num/num-bigint/blob/master/RELEASES.md)
- [Commits](https://github.com/rust-num/num-bigint/compare/num-bigint-0.2.6...num-bigint-0.4.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

3 files changed, 4 insertions, 4 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 9411a0c..ed641f9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -214,9 +214,9 @@ checksum = "2448f6066e80e3bfc792e9c98bf705b4b0fc6e8ef5b43e5889aff0eaa9c58743"
 
 [[package]]
 name = "num-bigint"
-version = "0.2.6"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "090c7f9998ee0ff65aa5b723e4009f7b217707f1fb5ea551329cc4d6231fb304"
+checksum = "4e0d047c1062aa51e256408c560894e5251f08925980e53cf1aa5bd00eec6512"
 dependencies = [
  "autocfg 1.0.1",
  "num-integer",
diff --git a/spake2/Cargo.toml b/spake2/Cargo.toml
index 55bea6d..3814c83 100644
--- a/spake2/Cargo.toml
+++ b/spake2/Cargo.toml
@@ -34,7 +34,7 @@ hex = "0.4"
 
 [dev-dependencies]
 bencher = "0.1"
-num-bigint = "0.2"
+num-bigint = "0.4"
 
 [[bench]]
 name = "spake2"
diff --git a/srp/Cargo.toml b/srp/Cargo.toml
index bb068c7..92748e3 100644
--- a/srp/Cargo.toml
+++ b/srp/Cargo.toml
@@ -11,7 +11,7 @@ keywords = ["crypto", "pake", "authentication"]
 categories = ["cryptography", "authentication"]
 
 [dependencies]
-num-bigint = "0.2"
+num-bigint = "0.4"
 generic-array = "0.14"
 digest = "0.9"
 lazy_static = "1.2"