Added changelog.

We should be all caught up.

Author: thejpster

CHANGELOG.md

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+# Changelog
+
+# Unreleased Changes
+
+# [Version v0.5.0](https://github.com/Neotron-Compute/Neotron-Pico/releases/tag/v0.5.0)
+
+* Sent to JLCPCB to assembly.
+   * Note that C901 and C902 part no.s were wrong and were manually fixed before ordering.
+* Replaced SIP resistor array for PS/2 ports with four SMD resistors
+
+# [Version v0.4.0](https://github.com/Neotron-Compute/Neotron-Pico/releases/tag/v0.4.0)
+
+* Swap fill on bottom layer to be 3.3V not Ground
+* Replace RTC with DIP package due to availability
+* Increase size of electrolytic capacitor footprint, to better suit size of common parts
+* Replaced VGA connector - in-stock ones have the pins set back from the board edge
+
+# [Version v0.3.0](https://github.com/Neotron-Compute/Neotron-Pico/releases/tag/v0.3.0)
+
+* Adds via stitching around the edge of the board
+
+# [Version v0.2.0](https://github.com/Neotron-Compute/Neotron-Pico/releases/tag/v0.2.0)
+
+* First complete PCB layout
+