Try fixing travis issue by removing mischief require/provide

info.rkt

@@ -6,8 +6,7 @@
 (define deps
   '("base"
     "rackunit-lib"
-    "fancy-app"
-    "mischief"))
+    "fancy-app"))
 
 
 (define build-deps

lenses/core/main.rkt

@@ -2,9 +2,18 @@
 
 (require mischief)
 
-(require/provide "base.rkt"
-                 "view-set.rkt"
-                 "contract.rkt"
-                 "transform.rkt"
-                 "identity.rkt"
-                 "compose.rkt")
+(require "base.rkt"
+         "view-set.rkt"
+         "contract.rkt"
+         "transform.rkt"
+         "identity.rkt"
+         "compose.rkt")
+
+(provide
+ (all-from-out
+  "base.rkt"
+  "view-set.rkt"
+  "contract.rkt"
+  "transform.rkt"
+  "identity.rkt"
+  "compose.rkt"))

lenses/main.rkt

@@ -1,9 +1,13 @@
 #lang racket
 
-(require mischief)
+(require "core/main.rkt"
+         "list/main.rkt"
+         "syntax.rkt"
+         "syntax-keyword.rkt")
 
-(require/provide
- "core/main.rkt"
- "list/main.rkt"
- "syntax.rkt"
- "syntax-keyword.rkt")
+(provide
+ (all-from-out
+  "core/main.rkt"
+  "list/main.rkt"
+  "syntax.rkt"
+  "syntax-keyword.rkt"))