Fix Changes formatting

Author: autarch

Changes.md

@@ -3,20 +3,15 @@
 * There was a leak in the `MMDB_open()` sub when it was called against a file
   which did not contain any MMDB metadata. Reported by Federico
   G. Schwindt. GitHub issue #36.
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 * Fixed an error that occurred when passing AI_V4MAPPED to `getaddrinfo()` on
   FreeBSD. Apparently this macro is defined but doesn't work the way we
   expected it to on that platform.
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 * Made sure to call `freeaddrinfo()` when a call to `getaddrinfo()` fails but
   still allocated memory.
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 * Fixed a segfault in the tests that occurred on FreeBSD if we passed a NULL
   value to `freeaddrinfo()`.
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 * Added a missing step to the README.md file for installing from our GitHub
   repository. Patch by Yasith Fernando.
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 * Added instructions for installing via Homebrew. Patch by Yasith Fernando.