Vendor dependencies for 0.3.0 release

vendor/approx/Cargo.toml

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+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+name = "approx"
+version = "0.5.1"
+authors = ["Brendan Zabarauskas <bjzaba@yahoo.com.au>"]
+description = "Approximate floating point equality comparisons and assertions."
+homepage = "https://github.com/brendanzab/approx"
+documentation = "https://docs.rs/approx"
+readme = "README.md"
+keywords = ["approximate", "assert", "comparison", "equality", "float"]
+license = "Apache-2.0"
+repository = "https://github.com/brendanzab/approx"
+[package.metadata.docs.rs]
+features = ["std", "num-complex"]
+
+[lib]
+name = "approx"
+[dependencies.num-complex]
+version = "0.4.0"
+optional = true
+
+[dependencies.num-traits]
+version = "0.2.0"
+default_features = false
+
+[features]
+default = ["std"]
+std = []