Bumping minimum Rust version 1.14.0 -> 1.22.0, as per https://git.io/fhDLO

.travis.yml

@@ -5,7 +5,7 @@ rust:
   - stable
   - beta
   - nightly
-  - 1.14.0
+  - 1.22.0
 os:
  - linux
  - windows
@@ -16,7 +16,7 @@ matrix:
   #  - we insist on rust 1.14 only for Debian, and
   #  - "rand" is only an optional dependency.
   exclude:
-  - rust: 1.14.0
+  - rust: 1.22.0
     os: windows
 
 script:

Cargo.toml

@@ -32,7 +32,7 @@ fuzztarget = []
 
 [dev-dependencies]
 rand = "0.6"
-rand_core = "0.4"
+rand_core = "0.3"
 serde_test = "1.0"
 
 [dependencies.rand]

README.md

@@ -20,5 +20,4 @@ Contributions to this library are welcome. A few guidelines:
 * Any breaking changes must have an accompanied entry in CHANGELOG.md
 * No new dependencies, please.
 * No crypto should be implemented in Rust, with the possible exception of hash functions. Cryptographic contributions should be directed upstream to libsecp256k1.
-* This library should always compile with any combination of features on **Rust 1.14**, which is the currently shipping compiler on Debian.
-
+* This library should always compile with any combination of features on **Rust 1.22**.