update several version numbers

Author: steveklabnik

src/editions/index.md

@@ -40,29 +40,4 @@ People using any edition of Rust will continue to see improvements as new
 stable releases are made.  In some cases however, mainly when new keywords are
 added, but sometimes for other reasons, there may be new features that are only
 available in later editions.  You only need to upgrade if you want to take
-advantage of such features.
-
-## Trying out the 2018 edition
-
-At the time of writing, there are two editions: 2015 and 2018. 2015 is today's
-Rust; Rust 2018 is currently in beta, and will land in stable in Rust 1.31, on December 6, 2018.
-
-To give the 2018 edition a try, install the beta toolchain:
-
-```console
-> rustup install beta
-````
-
-If you want the really bleeding edge, you can try nightly:
-
-```console
-> rustup install nightly
-```
-
-When you see commands like `cargo fix` elsewhere in this guide, you may
-need to preface them with the toolchain:
-
-```console
-> cargo +beta fix --edition
-> cargo +nightly fix --edition
-```
+advantage of such features.

src/rust-2018/macros/macro-changes.md

@@ -1,6 +1,6 @@
 # Macro changes
 
-![Minimum Rust version: beta](https://img.shields.io/badge/Minimum%20Rust%20Version-beta-orange.svg)
+![Minimum Rust version: 1.31](https://img.shields.io/badge/Minimum%20Rust%20Version-1.31-brightgreen.svg)
 
 ## `macro_rules!` style macros
 

src/rust-2018/module-system/path-clarity.md

@@ -1,6 +1,6 @@
 # Path clarity
 
-![Minimum Rust version: beta](https://img.shields.io/badge/Minimum%20Rust%20Version-beta-orange.svg)
+![Minimum Rust version: 1.31](https://img.shields.io/badge/Minimum%20Rust%20Version-1.31-brightgreen.svg)
 ![Minimum Rust version: nightly](https://img.shields.io/badge/Minimum%20Rust%20Version-nightly-red.svg) for "uniform paths"
 
 The module system is often one of the hardest things for people new to Rust. Everyone

src/rust-2018/module-system/raw-identifiers.md

@@ -1,6 +1,6 @@
 # Raw identifiers
 
-![Minimum Rust version: beta](https://img.shields.io/badge/Minimum%20Rust%20Version-beta-orange.svg)
+![Minimum Rust version: 1.30](https://img.shields.io/badge/Minimum%20Rust%20Version-1.30-brightgreen.svg)
 
 Rust, like many programming languages, has the concept of "keywords".
 These identifiers mean something to the language, and so you cannot use them in

src/rust-2018/ownership-and-lifetimes/inference-in-structs.md

@@ -1,6 +1,6 @@
 # `T: 'a` inference in structs
 
-![Minimum Rust version: beta](https://img.shields.io/badge/Minimum%20Rust%20Version-beta-orange.svg)
+![Minimum Rust version: 1.31](https://img.shields.io/badge/Minimum%20Rust%20Version-1.31-brightgreen.svg)
 
 An annotation in the form of `T: 'a`, where `T` is either a type or another
 lifetime, is called an *"outlives"* requirement. Note that *"outlives"* also

src/rust-2018/ownership-and-lifetimes/non-lexical-lifetimes.md

@@ -1,6 +1,6 @@
 # Non-lexical lifetimes
 
-![Minimum Rust version: beta](https://img.shields.io/badge/Minimum%20Rust%20Version-beta-orange.svg)
+![Minimum Rust version: 1.31](https://img.shields.io/badge/Minimum%20Rust%20Version-1.31-brightgreen.svg)
 
 The borrow checker has been enhanced to accept more code, via a mechanism
 called "non-lexical lifetimes." Consider this example:

src/rust-2018/trait-system/no-anon-params.md

@@ -1,6 +1,6 @@
 # No more anonymous trait parameters
 
-![Minimum Rust version: beta](https://img.shields.io/badge/Minimum%20Rust%20Version-beta-orange.svg)
+![Minimum Rust version: 1.31](https://img.shields.io/badge/Minimum%20Rust%20Version-1.31-brightgreen.svg)
 
 In accordance with RFC [#1685](https://github.com/rust-lang/rfcs/pull/1685),
 parameters in trait method declarations are no longer allowed to be anonymous.