Properly show healthcheck output on error

[josegonzalez]

Closes #95

[dokku-bot]

sh-checker report

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shellcheck errors

``` shellcheck checking is disabled. ```

shfmt errors

``` 'shfmt -l -d -i 2' returned error 1 finding the following formatting issues: ---------- test.bats --- test.bats.orig +++ test.bats @@ -203,8 +203,6 @@ @test "[check] command check-error" { echo '{"healthchecks":{"web":[{"attempts":1,"command":["python","-c","import sys; print(\"This is an error\"); sys.exit(1)"],"name":"command check","type":"startup","wait":0}]}}' >app.json - - run "$BIN_NAME" check dch-test-1 echo "output: $output" echo "status: $status" ---------- You can reformat the above files to meet shfmt's requirements by typing: shfmt -l -d -i 2 -w filename ```