[Windows] Comparison with stored snapshot fails due to line endings

[grimsa]

Preconditions:

• Use default json-snapshot configuration

Steps:

1. Run a test to create snapshot
2. Run a test again

Expected: test passess
Actual: test fails

Symptom: in Snapshot#toMatchSnapshot rawSnapshot contains lines separated by \n, while in currentObject lines are separated by \r\n.

This generates a failure with every line being different by just the \r symbol.

Root cause: SnapshotFile constructor uses hardcoded \n (line 33)
Possible workaround: use com.fasterxml.jackson.core.util.DefaultIndenter.SYS_LF instead (both there and in SPLIT_STRING).