Upgrade heck

Cargo.lock

@@ -1628,12 +1628,9 @@ dependencies = [
 
 [[package]]
 name = "heck"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d621efb26863f0e9924c6ac577e8275e5e6b77455db64ffa6c65c904e9e132c"
-dependencies = [
- "unicode-segmentation",
-]
+checksum = "2540771e65fc8cb83cd6e8a237f70c319bd5c29f78ed1084ba5d50eeac86f7f9"
 
 [[package]]
 name = "hermit-abi"
@@ -5073,12 +5070,6 @@ dependencies = [
  "tinyvec",
 ]
 
-[[package]]
-name = "unicode-segmentation"
-version = "1.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8895849a949e7845e06bd6dc1aa51731a103c42707010a5b591c0038fb73385b"
-
 [[package]]
 name = "unicode-width"
 version = "0.1.9"

plume-common/Cargo.toml

@@ -10,7 +10,7 @@ activitystreams-derive = "0.1.1"
 activitystreams-traits = "0.1.0"
 array_tool = "1.0"
 base64 = "0.13"
-heck = "0.3.0"
+heck = "0.4.0"
 hex = "0.4"
 hyper = "0.12.33"
 openssl = "0.10.22"