run tests with -short flag on pull requests

because they would fail since $GITHUB_TOKEN is not set

.appveyor.yml

@@ -15,9 +15,17 @@ test_script:
     - go build ./cmd/selfupdate-example
     - go build ./cmd/detect-latest-release
     - go build ./cmd/go-get-release/
-    - go test -v -race -coverprofile=coverage.txt ./selfupdate
+    - ps: |
+        if (Test-Path env:GITHUB_TOKEN) {
+            go test -v -race -coverprofile=coverage.txt ./selfupdate
+        } else {
+            go test -v -race -short ./selfupdate
+        }
 after_test:
-    - "SET PATH=C:\\Python34;C:\\Python34\\Scripts;%PATH%"
-    - pip install codecov
-    - codecov -f "coverage.txt"
+    - ps: |
+        if (Test-Path coverage.txt) {
+            "SET PATH=C:\\Python34;C:\\Python34\\Scripts;%PATH%"
+            pip install codecov
+            codecov -f "coverage.txt"
+        }
 deploy: off

.travis.yml

@@ -11,6 +11,11 @@ script:
   - go build ./cmd/selfupdate-example/
   - go build ./cmd/detect-latest-release/
   - go build ./cmd/go-get-release/
-  - go test -v -race -coverprofile=coverage.txt ./selfupdate
+  - |
+    if [[ "${GITHUB_TOKEN}" != "" ]]; then
+      go test -v -race -coverprofile=coverage.txt ./selfupdate
+    else
+      go test -v -race -short ./selfupdate
+    fi
 after_success:
-  - bash <(curl -s https://codecov.io/bash)
+  - if [ -f coverage.txt ]; then bash <(curl -s https://codecov.io/bash); fi