Fix version library.properties

Version should be semver compliant even if 1.0 is accepted.
https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5:-Library-specification#libraryproperties-file-format

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Author: fpistm

library.properties

@@ -1,5 +1,5 @@
 name=HTS221
-version=1.0
+version=1.0.0
 author=AST, Wi6Labs
 maintainer=stm32duino
 sentence=Capacitive digital sensor for relative humidity and temperature.