README: use pcb-tools-extension fork for now

README.rst

@@ -58,6 +58,14 @@ Quick Start Installation
 
 This will install gerbolyze and svg-flatten into a Python virtualenv and install usvg into your ``~/.cargo``.
 
+Note:
+    Right now (2020-02-07), ``pcb-tools-extension`` must be installed manually from the fork at:
+
+    ``pip3 install --user git+https://git.jaseg.de/pcb-tools-extension.git``
+
+    This fork contains fixes for compatibility issues with KiCAD nightlies that are still in the process of being
+    upstreamed.
+
 Debian
 ~~~~~~
 
@@ -75,6 +83,7 @@ Note:
     rustup default stable
     cargo install usvg
 
+    pip3 install --user git+https://git.jaseg.de/pcb-tools-extension.git
     pip3 install --user gerbolyze --no-binary gerbolyze
 
 Ubuntu
@@ -85,6 +94,7 @@ Ubuntu
     sudo apt install libopencv-dev libpugixml-dev libpangocairo-1.0-0 libpango1.0-dev libcairo2-dev clang make python3 git python3-wheel curl python3-pip python3-venv cargo
     cargo install usvg
 
+    pip3 install --user git+https://git.jaseg.de/pcb-tools-extension.git
     pip3 install --user gerbolyze --no-binary gerbolyze
 
 
@@ -96,6 +106,7 @@ Fedora
     sudo dnf install python3 make clang opencv-devel pugixml-devel pango-devel cairo-devel rust cargo
     cargo install usvg
 
+    pip3 install --user git+https://git.jaseg.de/pcb-tools-extension.git
     pip3 install --user gerbolyze --no-binary gerbolyze
     
 Arch
@@ -109,6 +120,7 @@ Arch
     rustup default stable
     cargo install usvg
 
+    pip3 install --user git+https://git.jaseg.de/pcb-tools-extension.git
     pip3 install --user gerbolyze --no-binary gerbolyze
 
 Build from source (any distro)
@@ -121,6 +133,7 @@ First, install prerequisites like shown above. Then,
     git clone --recurse-submodules https://git.jaseg.de/gerbolyze.git
     cd gerbolyze
 
+    pip3 install --user git+https://git.jaseg.de/pcb-tools-extension.git
     python3 -m venv
     source venv/bin/activate
     python3 setup.py install