Minor Fixes

• Fix Issue #2: Fijar 5 decimales a mostrar

Initial Stable Release

Initial Stable Release including:

• Compatible with all rates.
• Actual price close-up.
• Graph with the prices of the current day.
• Graph with the prices of the next day when you are available.
• Minimum and maximum of the current and next day.
• Icon indicating the current pricing period (Valley, Peak, Super-Valley).
• Added documentation