add notes for Eagle 5.2 release

Change-Id: If8bf5fc4dc90e82e8d427e8e7e0f92273c0725e6

Releases.md

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 For system image downloads, see [coral.ai/software](https://coral.ai/software/).
 
+
+## 5.2 (eagle)
+
++   Updated Python packages to support
+    [PyCoral](https://coral.ai/docs/reference/py/)
++   Further support in uboot for 2 GB boards
++   Various kernel updates, including:
+    +   defconfig: Include USB FTDI driver
+    +   defconfig: Add micro k8s / k3s deps
+    +   apex: Add power control
+    +   m4: Add M4 device tree overlay
+    +   i2s: Enable I2S output on 40-pin header
+    +   rt5645: Add a sysfs-based override for hp-detect
+
+
 ## 5.0 (eagle)
 
 +   Upgraded U-Boot bootloader to v2019.04