v3.0.0 (EIP-1559)

Major changes and additions:

• EIP-1559 london hardfork support by @tomasmik in #180

• Add all methods required to do simple swapping by @tomasmik in #176

• Remake transaction handling by @tomasmik in #159

• Introduce an exchange package that is actually usable by @tomasmik in #149

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Other small updates and bug fixes:

• Better gas price increment by @tomasmik in #150
• Do not default to nil if calculation fails by @tomasmik in #151
• Add block number method to the interface by @tomasmik in #152
• Longer blocking queue by @tomasmik in #153
• Incrementor and handler upgrade by @tomasmik in #154
• Expand interface by @tomasmik in #155
• Try to sync nonce if it goes out of sync by @tomasmik in #156
• Fix: Dont resend if known and pull nonce only if unknown by @tomasmik in #157
• Nonce should be unique per chain by @tomasmik in #158
• Update Depot logic by @tomasmik in #160
• Fix nonce tracking by @tomasmik in #161
• Better errors and less spam by @tomasmik in #162
• Dont depend on last transaction delivered for fillup by @tomasmik in #163
• Resend transaction if it's in state packing by @tomasmik in #164
• Resend transactions which were sent but don't appear in BC by @tomasmik in #165
• Add metrics iface by @tomasmik in #166
• Add polygonscan gas station by @tomasmik in #169
• Fix state updates by @tomasmik in #170
• UniswapV3 and WrappedMatic contract bindings by @tomasmik in #171
• If gas price is 30 or lower, use 31 by @tomasmik in #172
• Return the max of current gas and lastKnown*mult by @Guillembonet in #174
• Adapt to london hardfork by @tomasmik in #178
• Use the base price too by @tomasmik in #179

Full Changelog: v2.0.0...v3.0.0