Fix broken default exports and add missing import

Author: przemyslawzalewski

array/filterInPlace.js

@@ -1,4 +1,4 @@
-export default filterInPlace = f => xs => {
+export default f => xs => {
   let i = 0;
   let j = 0;
 

array/first.js

@@ -1 +1 @@
-export default first = ([x]) => x;
+export default ([x]) => x;

date/offsetByBit.js

@@ -1,3 +1,5 @@
+import fromSeconds from "./fromSeconds";
+
 const SECOND = fromSeconds(1);
 
 export default date => new Date(date - SECOND);