refactor: minor sylistic changes

Swaps places with the pattern:
```luau
x = x + 1
```

to use:
```luau
x += 1
```

lib/inflate.luau

@@ -2,7 +2,7 @@ local Tree = {}
 
 export type Tree = typeof(setmetatable({} :: TreeInner, { __index = Tree }))
 type TreeInner = {
-	table: { number }, -- len: 16 (🏳️‍⚧️❓)
+    table: { number }, -- len: 16
     trans: { number }, -- len: 288
 }
 
@@ -58,7 +58,6 @@ local distBits = table.create(30, 0)
 local distBase = table.create(30, 0)
 
 -- Special ordering of code length codes
--- stylua: ignore
 local clcIndex = {
     16, 17, 18, 0, 8, 7, 9, 6,
     10, 5, 11, 4, 12, 3, 13, 2,
@@ -82,7 +81,7 @@ local function buildBitsBase(bits: { number }, base: { number }, delta: number,
     -- build base table
     for i = 0, 29 do
         base[i] = sum
-		sum = sum + bit32.lshift(1, bits[i])
+        sum += bit32.lshift(1, bits[i])
     end
 end
 
@@ -138,7 +137,7 @@ local function buildTree(t: Tree, lengths: { number }, off: number, num: number)
     local sum = 0
     for i = 0, 15 do
         offs[i] = sum
-		sum = sum + t.table[i]
+        sum += t.table[i]
     end
 
     -- create code->symbol translation table

lib/init.luau

@@ -127,7 +127,7 @@ function ZipReader.parseCentralDirectory(self: ZipReader): ()
 		if buffer.readu32(self.data, pos) == SIGNATURES.END_OF_CENTRAL_DIR then
 			break
 		end
-		pos = pos - 1
+		pos -= 1
 	end
 
 	-- Central Directory offset is stored 16 bytes into the EoCD record
@@ -373,12 +373,12 @@ function ZipReader.getStats(self: ZipReader): ZipStatistics
 	-- Iterate through the entries, updating stats
 	for _, entry in self.entries do
 		if entry.isDirectory then
-			stats.dirCount = stats.dirCount + 1
+			stats.dirCount += 1
 			continue
 		end
 
-		stats.fileCount = stats.fileCount + 1
-		stats.totalSize = stats.totalSize + entry.size
+		stats.fileCount += 1
+		stats.totalSize += entry.size
 	end
 
 	return stats