Squashed 'ff/' changes from 661558e..ddff465

ddff465 Bump version and dependency on ff_derive
25d11d6 Bump version
95e2723 Bump version to 0.5.1
f76872a Add ?Sized to RngCore trait bounds (#14)
09a32b1 ff 0.5.0
32543ab Crate docs
22031dc Update READMEs
658fe6d CI: Check intra-doc links
35f5026 Add READMEs to Cargo.toml files
6804225 Migrate ff_derive to proc-macro2 1.0
b9a79ce cargo fmt
82574c2 cargo fix --edition-idioms for ff
3b0cf72 Add edition = 2018
8a2b51b Replace try! macro
40fc9ba cargo fix --edition for ff
22c67f3 cargo fmt
312141c Clarify masking of bits in Field::random impls
89a68e1 Migrate to rand 0.7
58415fb Migrate ff, group, pairing, and bellman to rand 0.6
8b6e6b1 Migrate ff to rand_core 0.3 (used by rand 0.5)

git-subtree-dir: ff
git-subtree-split: ddff4658ddd7496bb29cc636c391b7aaaca24673

ff_derive/Cargo.toml

@@ -1,12 +1,13 @@
 [package]
 name = "ff_derive"
-version = "0.3.0"
+version = "0.4.1"
 authors = ["Sean Bowe <ewillbefull@gmail.com>"]
 description = "Procedural macro library used to build custom prime field implementations"
 documentation = "https://docs.rs/ff/"
 homepage = "https://github.com/ebfull/ff"
 license = "MIT/Apache-2.0"
 repository = "https://github.com/ebfull/ff"
+edition = "2018"
 
 [lib]
 proc-macro = true
@@ -15,6 +16,9 @@ proc-macro = true
 num-bigint = "0.2"
 num-traits = "0.2"
 num-integer = "0.1"
-proc-macro2 = "0.4"
-quote = "0.6"
-syn = "0.14"
+proc-macro2 = "1"
+quote = "1"
+syn = "1"
+
+[badges]
+maintenance = { status = "passively-maintained" }