holy wars... the punishment due

This release has many interesting news:

New templates

• GetStockIndex to get the composition of B3 indexes.
• GetTheoricalPortfolio to get composition and weights of B3 indexes.
• GetPortfolioDay to get composition, weights and segments of B3 indexes.
• CenariosCurva for scenarios of term structures of interest rates.
• CenariosPrecoReferencia for reference prices scenarios.
• IndexReport indexes daily market data.
• PriceReport daily prices and market data.
• GetListedSupplementCompany supplement data for listed companies.
• GetDetailsCompany to get companies details (name, codeCVM, ...).
• GetListedCashDividends to get list of cash dividends.

New functions for yield curves

• yc_ipca_get and yc_ipca_mget for real interest rates
• yc_usd_get and yc_usd_mget for USD interest rates in Brazil

New functions for cotahist

• cotahist_get_symbols to get stocks by a list of symbols
• cotahist_etfs_get, cotahist_fiis_get, cotahist_fidcs_get, cotahist_fiagros_get
• function cotahist_funds_get has been replaced by these ones.

New functions to get indexes information (composition, weights and positions)

• index_comp_get returns the index composition
• index_weights_get returns the index weights
• index_by_segment_get returns indexes assets grouped by segments
• indexes_get lists the available indexes
• indexes_last_update returns the date when the indexes have been updated
• indexreport_get and indexreport_mget download index report data

Superset datasets

• cotahist_equity_options_superset joins options data, equity data and interest rates for each option - this is useful to run option and volatility models.
• yc_superset, yc_usd_superset, yc_ipca_superset mark futures maturities in yield curve.

Other improvements

• updated to bizdays version 0.1.10 (use of load_builtin_calendars - Issue #31).
• changes to ropensci process: added more tests to improve test coverage, functions renamed, codemeta and Contributing.md.