#10 #63 features were implemented.

#10 When requesting information about bonds (with the `--info` or `-i` key), more data is now calculated and displayed: bond payment calendar, total number of payments and already redeemed coupons, coupons yield (average coupon daily yield * 365), current price yield (average daily yield * 365), ACI and coupon's size. To request the necessary information, the `RequestBondCoupons()` (returns a dictionary of processed data received from the server) and `ExtendBondsData()` (returns an extended pandas dataframe containing more information about bonds) methods were implemented to extend bonds data with more information. The `ShowInstrumentInfo()` method has been improved to display more information on bonds and the payment calendar. To receive extended information about bonds in XLSX-format now you can use `--bonds-xlsx` (`-b`) key.

#63 The `CreateBondsCalendar()` method is implemented, which generates a pandas dataframe with a general payment calendar for the specified or all bonds. The `ShowBondsCalendar()` method displays the calendar in the console and saves it to a file, `calendar.md` by default in Markdown format. To request a payment calendar, you need to use the `--calendar` (`-c`) key. Also, the table in XLSX format will be saved to the default file `calendar.xlsx`.