travis: update rust version to 1.24.1 and 1.31.0.

1.24.1 is now the oldest version we test support for. All major
distributions appear to be at this version or new.

With the release of 1.31.0 just out, test that as the most
recent version.

diff --git a/.travis.yml b/.travis.yml
index e15edd686af6fdd490dc008ff6bf3132249daed7..061b0d259d11e782d5a47c2d6a422efc54a75d2d 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -85,46 +85,46 @@ matrix:
         - DO_CHECK_SETUP_SCRIPTS="yes"
         - DO_DISTCHECK="yes"
     # Linux, gcc, Rust (auto detect).
-    # - Rust 1.29.1, the latest known working version.
+    # - Rust 1.31.0, the latest known working version.
     - os: linux
       compiler: gcc
       env:
-        - NAME="linux,gcc,rust-1.29.1-disabled"
+        - NAME="linux,gcc,rust-1.31.0-disabled"
         - *default-cflags
         - ENABLE_RUST="yes"
-        - RUST_VERSION="1.29.1"
+        - RUST_VERSION="1.31.0"
         - ARGS="--disable-rust"
         - DO_DISTCHECK="yes"
     # Linux, gcc, Rust (auto detect).
-    # - Rust 1.29.1, the latest known working version.
+    # - Rust 1.31.0, the latest known working version.
     - os: linux
       compiler: gcc
       env:
-        - NAME="linux,gcc,rust-1.29.1-auto"
+        - NAME="linux,gcc,rust-1.31.0-auto"
         - *default-cflags
         - ENABLE_RUST="yes"
-        - RUST_VERSION="1.29.1"
+        - RUST_VERSION="1.31.0"
         - ARGS=""
         - DO_DISTCHECK="yes"
     # Linux, gcc, Rust.
-    # - Rust 1.29.1, the latest known working version.
+    # - Rust 1.31.0, the latest known working version.
     - os: linux
       compiler: gcc
       env:
-        - NAME="linux,gcc,rust-1.29.1"
+        - NAME="linux,gcc,rust-1.31.0"
         - *default-cflags
         - ENABLE_RUST="yes"
-        - RUST_VERSION="1.29.1"
+        - RUST_VERSION="1.31.0"
         - ARGS="--enable-rust --enable-rust-strict"
         - DO_DISTCHECK="yes"
-    # Linux, gcc, Rust (1.21.0 - oldest supported).
+    # Linux, gcc, Rust (1.24.1 - oldest supported).
     - os: linux
       compiler: gcc
       env:
-        - NAME="linux,gcc,rust-1.21.0"
+        - NAME="linux,gcc,rust-1.24.1"
         - *default-cflags
         - ENABLE_RUST="yes"
-        - RUST_VERSION="1.21.0"
+        - RUST_VERSION="1.24.1"
         - ARGS="--enable-rust --enable-rust-strict"
         - DO_DISTCHECK="yes"
     # Linux, gcc, -DNDEBUG.