Fix indenting in CONTRIBUTING.md

CONTRIBUTING.md

@@ -25,9 +25,9 @@ A useful bug report filed as a Github issue provides information about how to re
 2. If the problem is caused by a Julia package rather than core Julia, file a bug report with the relevant package author rather than here.
 
 3. When filing a bug report, provide where possible:
-- The full error message, including the backtrace.
-- A minimal working example, i.e. the smallest chunk of code that triggers the error. Ideally, this should be code that can be pasted into a REPL or run from a source file. If the code is larger than (say) 50 lines, consider putting it in a [gist](https://gist.github.com).
-- The version of Julia you are using as provided by the `versioninfo()` command. Occasionally, the longer output produced by `versioninfo(true)` may be useful also.
+  - The full error message, including the backtrace.
+  - A minimal working example, i.e. the smallest chunk of code that triggers the error. Ideally, this should be code that can be pasted into a REPL or run from a source file. If the code is larger than (say) 50 lines, consider putting it in a [gist](https://gist.github.com).
+  - The version of Julia you are using as provided by the `versioninfo()` command. Occasionally, the longer output produced by `versioninfo(true)` may be useful also.
 
 4. For segfaults or other hard crashes:
   - Try running the code with the debug REPL. If you have a source distribution of Julia, you can build your own debug REPL with `make debug`, which produces the `usr/bin/julia-debug-basic` and `usr/bin/julia-debug-readline` REPLs.