Inflation bug fixes (#2982)

* PENDING.md; swap BeginBlocker ordering
* Calculate inflation every block
* Update x/mint spec
* Reset distribution info bond height instead

docs/spec/mint/begin_block.md

@@ -1,12 +1,12 @@
 # Begin-Block
 
-Inflation occurs at the beginning of each block, however minting parameters
-are only calculated once per hour.
+Minting parameters are recalculated and inflation
+paid at the beginning of each block.
 
 ## NextInflationRate
 
-The target annual inflation rate is recalculated at the first block of each new
-hour. The inflation is also subject to a rate change (positive or negative)
+The target annual inflation rate is recalculated each block.
+The inflation is also subject to a rate change (positive or negative)
 depending on the distance from the desired ratio (67%). The maximum rate change
 possible is defined to be 13% per year, however the annual inflation is capped
 as between 7% and 20%.
@@ -14,7 +14,7 @@ as between 7% and 20%.
 ```
 NextInflationRate(params Params, bondedRatio sdk.Dec) (inflation sdk.Dec) {
 	inflationRateChangePerYear = (1 - bondedRatio/params.GoalBonded) * params.InflationRateChange
-	inflationRateChange = inflationRateChangePerYear/hrsPerYr
+	inflationRateChange = inflationRateChangePerYear/blocksPerYr
 
 	// increase the new annual inflation for this next cycle
 	inflation += inflationRateChange

docs/spec/mint/state.md

@@ -8,7 +8,6 @@ The minter is a space for holding current inflation information.
 
 ```golang
 type Minter struct {
-	LastUpdate       time.Time // time which the last update was made to the minter
 	Inflation        sdk.Dec   // current annual inflation rate
 	AnnualProvisions sdk.Dec   // current annual exptected provisions
 }
@@ -30,4 +29,3 @@ type Params struct {
 	BlocksPerYear       uint64   // expected blocks per year
 }
 ```
-