Update Travis CI config

- Remove unnecessary environment variable GITHUB_OAUTH_TOKEN (former API limit has been [removed](composer/composer#4884 (comment)) in 2016)
- Remove manual doctrine/instantiator downgrade
- We support only PHP 7.3 and 7.4 as well as M2 starting from v2.3.3 (former versions reached EOL)

.travis.yml

@@ -1,17 +1,21 @@
 language: php
 php:
-  - 7.2
-  - 7.1
+  - 7.4
+  - 7.3
 env:
-  - M2_VERSION=2.3.2
-  - M2_VERSION=2.3.1
-  - M2_VERSION=2.3.0
-matrix:
+  - M2_VERSION=2.4.2
+  - M2_VERSION=2.4.1
+  - M2_VERSION=2.4.0
+jobs:
   include:
-    - php: 7.1
-      env: M2_VERSION=2.2.9
-    - php: 7.0
-      env: M2_VERSION=2.2.9
+    - php: 7.3
+      env: M2_VERSION=2.3.6-p1
+    - php: 7.3
+      env: M2_VERSION=2.3.5
+    - php: 7.3
+      env: M2_VERSION=2.3.4
+    - php: 7.3
+      env: M2_VERSION=2.3.3
 cache:
   directories:
     - $HOME/.composer/cache

dev/ci/build.sh

@@ -20,8 +20,7 @@ for envkey in \
   MODULE_SRC_DIR \
   M2_VERSION \
   M2_REPO_USERNAME \
-  M2_REPO_PASSWORD \
-  GITHUB_OAUTH_TOKEN
+  M2_REPO_PASSWORD
 do
   if [ -z "$(eval echo \$$envkey)" ]
   then
@@ -44,8 +43,6 @@ fi
 # Set composer authentication params
 "$COMPOSER_BIN" config --global \
   "http-basic.repo.magento.com" "$M2_REPO_USERNAME" "$M2_REPO_PASSWORD"
-"$COMPOSER_BIN" config --global \
-  "github-oauth.github.com" "$GITHUB_OAUTH_TOKEN"
 
 set -x
 
@@ -57,12 +54,6 @@ set -x
   magento/project-community-edition \
   "$BUILD_DIR" "$M2_VERSION"
 
-# Downgrade doctrine/instantiator for PHP < 7.1 support
-"$COMPOSER_BIN" require \
-  --working-dir="$BUILD_DIR" \
-  --ignore-platform-reqs \
-  doctrine/instantiator:v1.0.5
-
 # Copy module into Magento
 mkdir -p "$(dirname "$MODULE_DST_DIR")"
 cp -r "$MODULE_SRC_DIR" "$MODULE_DST_DIR"