Added indentation.

appveyor.yml

 init:
-ps: |
-$ErrorActionPreference = "Stop"
-Invoke-WebRequest http://raw.github.com/krlmlr/r-appveyor/master/scripts/appveyor-tool.ps1 -OutFile "..\appveyor-tool.ps1"
-Import-Module '..\appveyor-tool.ps1'
+  ps: |
+        $ErrorActionPreference = "Stop"
+        Invoke-WebRequest http://raw.github.com/krlmlr/r-appveyor/master/scripts/appveyor-tool.ps1 -OutFile "..\appveyor-tool.ps1"
+        Import-Module '..\appveyor-tool.ps1'
+
 install:
-ps: Bootstrap
+  ps: Bootstrap
+
 build_script:
-- travis-tool.sh install_deps
+  - travis-tool.sh install_deps
+
 test_script:
-- travis-tool.sh run_tests
+  - travis-tool.sh run_tests
+
 on_failure:
-- travis-tool.sh dump_logs
+  - travis-tool.sh dump_logs
+
 artifacts:
-- path: '*.Rcheck\**\*.log'
-name: Logs
-- path: '*.Rcheck\**\*.out'
-name: Logs
-- path: '*.Rcheck\**\*.fail'
-name: Logs
-- path: '*.Rcheck\**\*.Rout'
-name: Logs
-- path: '\*_*.tar.gz'
-name: Bits
-- path: '\*_*.zip'
-name: Bits
\ No newline at end of file
+  - path: '*.Rcheck\**\*.log'
+    name: Logs
+
+  - path: '*.Rcheck\**\*.out'
+    name: Logs
+
+  - path: '*.Rcheck\**\*.fail'
+    name: Logs
+
+  - path: '*.Rcheck\**\*.Rout'
+    name: Logs
+
+  - path: '\*_*.tar.gz'
+    name: Bits
+
+  - path: '\*_*.zip'
+    name: Bits
\ No newline at end of file