Use "SemVer" compliant library version number

baldram · web-flow · commit fc49833095d4 · 2018-08-03T09:15:23.000+02:00
As Arduino IDE requires version number which is SemVer compliant, it was changed according to specification below: https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5:-Library-specification#libraryproperties-file-format https://semver.org/
diff --git a/library.json b/library.json
@@ -1,6 +1,6 @@
 {
   "name": "ESP_VS1053_Library",
-  "version": "1.0.9a",
+  "version": "1.0.9-a",
   "keywords": "vs1053, esp8266, esp32, nodemcu, codec, mp3",
   "description": "This is a driver library for VS1053 MP3 Codec Breakout adapted for Espressif ESP8266 and ESP32 boards",
     "authors": [

Original file line number	Diff line number	Diff line change
`@@ -1,6 +1,6 @@`
`1`	`1`	`{`
`2`	`2`	`"name": "ESP_VS1053_Library",`
`3`		`- "version": "1.0.9a",`
	`3`	`+ "version": "1.0.9-a",`
`4`	`4`	`"keywords": "vs1053, esp8266, esp32, nodemcu, codec, mp3",`
`5`	`5`	`"description": "This is a driver library for VS1053 MP3 Codec Breakout adapted for Espressif ESP8266 and ESP32 boards",`
`6`	`6`	`"authors": [`