Small improvements to input and install docs, bump deps

package.json

@@ -97,9 +97,9 @@
     "color": "^3.1.0",
     "detect-libc": "^1.0.3",
     "fs-copy-file-sync": "^1.1.1",
-    "nan": "^2.12.1",
+    "nan": "^2.13.1",
     "npmlog": "^4.1.2",
-    "prebuild-install": "^5.2.4",
+    "prebuild-install": "^5.2.5",
     "semver": "^5.6.0",
     "simple-get": "^3.0.3",
     "tar": "^4.4.8",
@@ -109,7 +109,7 @@
     "async": "^2.6.2",
     "cc": "^1.0.2",
     "decompress-zip": "^0.3.2",
-    "documentation": "^9.3.0",
+    "documentation": "^9.3.1",
     "exif-reader": "^1.0.2",
     "icc": "^1.0.0",
     "license-checker": "^25.0.1",