Create changelog.md

Request on Issue #93

changelog.md

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+## v0.1:
+###### NO TAG `commit 3887596426a2b5e3b09c09288545281a36e0f2d2`
+- ???
+
+## v0.1.1:
+###### NO TAG `commit a247dc787dd0fdc7ba8ca5c20f255f1ffbb451bc`
+- ???
+
+### v0.1.5:
+###### NO TAG `commit 02e277f45ae8a8044118e85b48484cda5e0a59ca`
+- ???
+
+### v0.1.6:
+###### NO TAG `commit eff5dd7af0945cc1265c6427ca1ac93bb919318a`
+- ???
+
+### v0.1.7 features:
+###### NO TAG `commit ffb9727e41f4ee813d59da54732494e33c22c318`
+- improved error message for RPi.GPIO dependency when using pingo.rpi
+
+### v0.1.9 features:
+###### TAG `commit 51dc60acf75625fd5af2b156b81199f83a40f6c6`
+- PcDuino (only digital pins support)
+- Arduino support via Firmata Protocol
+- Analog pins support
+- AutoDetection
+- pytest replaces unittest
+
+### v0.2.0 features: 
+###### TODO TAG `commit f6f3f8b591434c73a858310d9c06fb19787d762d`
+- RaspberryPiBPlus()
+- pcDuino V3
+- StrKeyDict()
+- PyMata replaces pyfirmata