Added Power-bomb Upgrade

This upgrade gets to a monkey through a pill (The Power Bomb Pill (PBP). This upgrade's abbreviation is PBU. It appears at Rank 19. == The True Upgrade == This upgrade is where a tower bombs the track with a bird & a bomb stronger than the bomb bird. === Upgrades === It can be upgraded, too. In ABTD5, this upgrade only has two paths with 3 upgrades each. Each upgrade costs the same per game. This upgrade doesn't have an ability. ==== P1 Upgrades ==== {| class="article-table" ! !T1 Upgrade !T2 Upgrade !T3 Upgrade |- |PBU Upgrade |2 Bombs |3 Bombs |5 Bombs |- |Cost |60 |200 |560 |- |Ability |The tower shoots 2 bombs. |The tower shoots 3 bombs. |The tower shoots 5 bombs. |} P2 Upgrades {| class="article-table" ! ! ! ! |- |PBU Upgrade |Bigger Bombs |Faster Bombs |Super-cluster Bombs |- |Cost |90 |300 |1,860 |- |Ability |Bombs are twice as big. |Bombs are twice as fast. |Bombs cluster into 13 smaller bombs after first explosion. |}

The True Upgrade
This upgrade is where a tower bombs the track with a bird & a bomb stronger than the bomb bird.

Upgrades
It can be upgraded, too. In ABTD5, this upgrde only has 2 paths with 3 upgrades each. Each upgrade costs the same per game. This upgrade doesn't have an ability.