Remove broken link

This whole statement is actually a bit redundant and covered by the
section immediately below it.

README.md

@@ -7,8 +7,6 @@ The [Earth Gravitational Models](https://en.wikipedia.org/wiki/Earth_Gravitation
 
 This library includes data derived from [EGM 2008](https://earth-info.nga.mil/index.php?dir=wgs84&action=wgs84) along with an interpolation function. Together, these allow for an approximate offset to be obtained for arbitrary points on the globe.
 
-The `geoid.rs` file containing terrain data is [generated using the Fortran program](./tools/README.md) provided by NGA.
-
 ## Updating `geoid.rs`
 
 The `src/geoid.rs` file is generated by a Python script (`generate.py`) that