updates README. Fixes APCs on camera (#7028)

No, a description isn't necessary. It allows me to do this, tho.

code/modules/power/apc.dm

@@ -77,6 +77,7 @@
 	anchored = 1
 	use_power = 0
 	req_access = list(access_engine_equip)
+	gfi_layer_rotation = GFI_ROTATION_DEFDIR
 	var/area/area
 	var/areastring = null
 	var/obj/item/weapon/cell/cell

html/changelogs/apcs and photos.yml

@@ -0,0 +1,4 @@
+author: Karolis2011
+delete-after: True
+changes: 
+  - bugfix: "Now APCs look decently on cameras."

tools/mapcapturemerge/README.md

@@ -14,5 +14,6 @@ Map capture merge tool manual
 5. After execution you will find all merged map images in this folder.
 
 Notes:
- * This tool been tested with Python 2.7.6 under Windows 10 Bash.
- * This tool also been tested with Python 3.6.1 under Windows 10.
+ * This tool has been tested with Python 2.7.6 under Windows 10 WSL Bash.
+ * This tool has been tested with Python 3.6.1 under Windows 10.
+ * This tool has been tested with Python 3.7.3 under Windows 10 1903.