Bumping the expected rust build containers to Rust 2018 (1.31)

.gitlab-ci.yml

@@ -4,7 +4,7 @@ stages:
   - deploy
 
 tests:
-  image: rust:1.30-stretch
+  image: rust:1.31-stretch
   stage: test
   script:
     - cargo test
@@ -12,7 +12,7 @@ tests:
     - docker
 
 debug:
-  image: rust:1.30-stretch
+  image: rust:1.31-stretch
   stage: build
   script:
     - cargo build
@@ -24,7 +24,7 @@ debug:
     - docker
 
 release:
-  image: rust:1.30-stretch
+  image: rust:1.31-stretch
   stage: build
   script:
     - cargo build --release

docker/build-linux.bat

@@ -7,5 +7,5 @@ docker run --rm ^
 -v "%cd%\docker\linux\target":/usr/src/rsddns/target ^
 -v "%cd%\docker\linux\cargo":/tmp/cargo ^
 -w /usr/src/rsddns ^
-rust:1.30.1-stretch ^
+rust:1.31-stretch ^
 cargo build --release && strip /usr/src/rsddns/target/release/rsddns